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 Battery and Charger Safety

 

battery and charger safety

Please note that the information contained in this guide is for informational purposes only. You should consult your batteries manual for specific instructions regarding the handling, charging and safe usage of your batteries.

Take a look on this video to see how dangerous battery is especially Li-Po battery when you mishandling it.

We've taken the time to write down a short intro to LiPo batteries for your convenience. Please take the time to read through before you charge if you are not familiar with LiPo battery chemistry.

 


First Tips About Li-Po Battery: (Please also read the rest until finish!!!)

  1. Charge the Li-Po battery in a container that in case of fire, it will not spread. Recommended container to charge Li-Po battery are:
    1. Li-Po battery charging bag. This bag can be found on online or eBay. Just search it and you will find many sellers sell them.
    2. Charge in a metal box.
    3. Charge in ammo box.
  2. You need to pay attention to where you charge your Li-Po battery. Place like carpet, bed, sofa are not good place to charge Li-Po battery. Find a spot and surrounding that cannot get caught on fire in case of battery failure.
  3.  Do not charge a lithium polymer battery at a higher voltage than it’s rated for, or overcharging it, it can lead to a fire or an explosion.
  4. Charge Li-Po battery with correct charger and it is designed for Li-Po battery.
  5. Never leave a charging lithium polymer battery pack unattended.
  6. Have a fire extinguisher ready in case fire occurs. DO NOT try to kill the fire with water.
  7. Remember that the smoke caused from burnt Li-Po is toxic and must be avoided.
  8. When storing Li-Po battery, always store your Li-Po pack in a safe and non flammable container away from flammable objects. A Li-Po Sack or metal / ceramic storage container is best.
  9. When not in use, disconnect the battery from the model as it will keep discharge the battery and can damage it. It also has fire and explosion risk to it...

Above information are the first things to know. It does not mean they are the only thing you need to know because there are also other important things that you must know that is critical too. Please keep reading until you fully understand.
 

NIMH Battery

The average charging time for the NIMH battery is about 1.5 - 2 hours (for Z400 stock battery is about 30 minutes ONLY). However, when you are charging the battery, please always pay attention to the battery charging. When the battery get WARM (NOT HOT), then it is fully charged. IMPORTANT: ALWAYS PAY ATTENTION TO THE BATTERY WHEN YOU ARE CHARGING THE BATTERY. DO NOT OVER CHARGE THE BATTERY - IT CAN BE VERY DANGER.

Li-Po Battery

What is Lithium Polymer or Li-Po Battery?

Lithium Polymer or Li-Po batteries are a great new way of storing energy for portable devices from cell phones to RC helicopters.

They’re great because they can store 350% (approximately) more energy than a typical Nickel Cadmium (Ni-Cd) battery pack and weigh 10% – 20% less. They can also discharge much more current than a Ni-Cd battery and be fully charged in about an hour or two. Li-Po batteries also don’t develop memory or voltage depression characteristics like Ni-Cd batteries, and do not need to be discharged before being charged.

However they’re not without their downside. These batteries can lead to fire, explosions and toxic smoke inhalation from the burning that occurs.

Li-Po or Lithium Polymer is a type of battery chemistry. These batteries are excellent for use in an application such as remote control aircraft due to their high energy to weight ratio. However, they do require a little special care to make sure that they always work as expected and to minimize risk of battery failure that can cause fire or explosion.

Li-Pos can be dangerous if overcharged, or over-discharged. Lithium burns very quickly when exposed to air, so fast that it looks like the lithium is exploding and because of the volatile electrolyte used in Li-Po’s, they can catch fire or explode.

RC Li-Po batteries require unique and proper care if they are going to last for any length of time more so than any other battery technology. Charging, discharging, and storage all affect the lifespan – get it wrong and a Li-Po is garbage in as little as one mistake.

In the rest of this guide, we’ll try to discuss as complete as we can how to charge, store and handle lithium polymer batteries safely so you can enjoy them again and again.

Please note that the information contained in this guide is for general informational purposes only that we find essential. However you should consult your batteries manual for specific instructions regarding the handling, charging and safe usage of your lithium polymer batteries if any. There is also plenty of information available on the net. Have sometimes to read them if you find information in our website is still in adequate.

Understanding Li-Po Battery Cells and Voltage

Lithium Polymer or Li-Po batteries have very specific charging requirements and MUST only be changed by specific chargers designed to charge lithium polymer batteries. Using balance charger for Li-Po battery is greatly recommended. Check whether the balance charger specification suits your Li-Po battery.

A Li-Po battery contains one or more cells. A 1s or 1 cell Li-Po battery has always a nominal voltage of 3.7v. When fully charged it has a maximum voltage of 4.2v and when fully discharged, it should never go below 3.0v without risking cell damage. So if you see a Li-Po battery saying 11.1V it means it has 3 cells in series circuit (3s) (3.7V x 3 = 11.1V), Li-Po battery that is saying 7.4 V means it has 2 cells in series circuit (2s) (3.7V x 2 = 7.4V) and so on.

The term “mAh” is the energy capacity of the battery. 1100 mAh has more capacity than 700 mAh thus 1100 mAh has more usage time than 700 mAh and so on.

Another more complicated configuration says “5s4p” battery pack means that the pack contains 5 cells in a series circuit and 4 cells in a parallel circuit. Cells that are attached one another in series will increase voltage and if in parallel will increase current. Therefore in combination s and p for example 5s4p, it will first increase voltage to 5x3.7 = 18.5 V (5s) and the current will be increased too as there are 4 sets of “5 cells in series” and they are mounted in parallel.

Since each cell is 3.7v (nominal) a 5s Li-Po battery has a nominal voltage of 18.5v, a fully charged voltage of 21.0v and a maximum discharged voltage of 15.0v before damage occurs.

When charging this Li-Po (5s4p), they must be charged at the voltage of the number of cells in series, therefore a 5s4p pack must be charged as a 5 cell pack which is 3.7V x 5 = 18.5V.

The Li-Po charger you’re using must be able to handle the cell count of the battery you are charging.

Most of the more expensive Li-Po chargers will automatically detect the cell count of the battery being charged while the cheaper ones will require a manual setting. While some of the really good ones will allow you to manually select the cell count and then will double check it automatically for you.

Please also note that some chargers (such as those used for toys or cell phones) are made to charge a specific cell count and are not configurable for other cell counts. It is very important that these chargers only be used to charge the batteries they are designed for.

Also, chargers that auto detect the cell count of a Li-Po battery can sometimes be wrong. They use the current voltage of the battery to determine the cell count and if the battery is fully charged or at a lower voltage than it should be, it may read the cell count incorrectly. This is why it is very important to double check that it reads he right cell count which is typically displayed on the LCD display.

For example a 5 cell 18.5 volt Li-Po battery that’s been depleted to less than 15 volts may be confused with a 4 cell, 14.8v battery and thus charged as such. Also, a fully charged 5 cell battery at 21.0v may be confused as a 6 cell 22.0v battery and charged as such.


Charging a lithium polymer battery at a higher voltage than it’s rated for, or overcharging it, can lead to a fire or an explosion (see video below).

 


Li-Po Battery Charging Tips

  • Please check your Li-Po before you charge it. Look for signs of swelling of the individual cells, any discoloration or if any part of the pack is warm. If your pack has any of those characteristics, DO NOT charge or discharge it. Read how to dispose it later in this article below. Put in a safe place/container in a safe surrounding when you are preparing to dispose it.
  • Always use a charger made to charge Li-Po packs. And the charger must suit the type of the Li-Po you are about to charge it as explained above.
  • Double check that the settings for the lithium polymer charger are correct for the pack being charged – this includes the cell count as well as the current settings. 
  • In general, most lithium polymer batteries should be charged to no more than 4.2 volts per cell or depleted to less than 3.0 volts per cell. There are new generation batteries available that can handle higher / lower voltages, but they are still new and thus are the exception to the rule. 
  • Ensure that charging leads are connected correctly. Reverse charging can lead to cell damage or a fire or explosion. 
  • Always charge Li-Po batteries on surfaces that won’t catch on fire such as cement, steel, ceramic or stone. Wooden tables and carpeted floors are not recommended charging surfaces. 
  • Do not charge batteries near flammable products/material or flammable liquids. 
  • Never charge a Li-Po battery while it is inside your model or other electronic device. If it catches fire it can lead to total destruction of the item it is being charged in. 
  • Li-Po batteries should be charged in a room within a temperature range of 0C to 50C. Batteries charged outside this temperature range may experience leakage, heat generation or cell damage. 
  • Li-pos should NOT get warm during a charge. During a discharge, they should not exceed 60 Celsius (worst case, lower is obviously better). 
  • Never leave a charging lithium polymer battery pack unattended. 
  • Do not charge inside an automobile, especially while driving. 
  • Do not store batteries inside an automobile. 
  • Do not charge a lithium polymer battery pack at a rate over 1C. (See charging time section below about the meaning of 1C)
  • Never charge a Li-Po pack that has ballooned or swelled due to over / under charging or from a crash. Read how to dispose it later in this article below. Put in a safe place/container in a safe surrounding when you are preparing to dispose it.
  • Never charge a lithium polymer battery pack that has been punctured or damaged in a crash. 
  • Never, under ANY circumstances let the positive and negative battery leads touch. It can lead to cell ballooning, cell damage or fire or an explosion. 
  • Have a fire extinguisher near the charging area or a large bucket of dry sand. Do not try to distinguish with water. 
  • If you notice your Li-Po battery pack is swelling, stop the charging process immediately, put the battery in a safe container and observe it for 15 minutes. And then follow the instruction below later in this article how to dispose it. You can no longer use it.

The Charging Time

To know how much time needed to charge a Li-Po battery, you need to know a term called C rating. In the late 1700s, Charles-Augustin de Coulomb ruled that a battery that receives a charge current of one ampere (1A) passes one coulomb (1C) of charge every second.

It means that 1C for an 1100mAh battery is 1.1A; 1C for a 1600mAh battery is 1.6A and so on.

It is recommended to keep the charge below 1C.

So for example if your battery is 1100 mAh, the 1C rate is 1.1A. To safely charge the battery, you need a charger that has charge rate or output current maximum 1.1 A.

The lesser the better, ideally 50-70% of the 1C charge rate. It takes longer to charge but safe.

Therefore for ideal 1C charge rate will need 1 hour charging time from empty to full. I.E: for 1100 mAh (1.1Ah), and if charged with 1C rate, which is 1.1A will need 1.1Ah / 1.1A = 1 hour.

However as has been mentioned before that charging rate less than 1C is better. For example, a balance charger that has output 0.8A will need about 1.4 hour charging time. (1.1 Ah / 0.8A = 1.4 hour or 1 hour 24 minutes). If you find your charger is still charging more than expected time, stop the charging immediately and contact your supplier immediately. For above example, ideally it needs 1 hour 24 minutes, but we can give up to 2 hours max before you contact your supplier. Don’t forget about safety precaution described above.
 

Discharge Rate

A Li-Po battery consists of multiple cells. These cells deliver approx. 3.7 Volts. A 4S Li-Po would therefore supply 14.8V.

Apart from the cells, a discharge rate is defined by the letter 'C'. Most batteries cases say something like "25C to 40C" discharge rate. This means that 25C is the nominal discharge rate and 40C is the maximum burst discharge rate. It's advisable to stay on or below nominal discharge level to preserve battery future life. Not all brands say something about the peak discharge rate on the battery itself. For more on that, I suggest to read the manual or ask your supplier.

The battery's capacity is defined in mAh. mAh means milli-Ampere per hour. A battery with a 1000mAh capacity can deliver 1 Ampere (1000mA/1000) for 1 hour or 1 mA for 1000 hours. The battery capacity, together with the Li-Po battery's discharge rate will define its maximum current output (Ampere, A). This fact is very important to keep in mind, when choosing a Li-Po battery. The combination of capacity and discharge rate is what you will need. It's important to know that the battery cells don't count up for maximum current draw. The amount of cells only determines the voltage (V) of your Li-Po, as needed for your equipment.

Example calculation of discharge rate:

A 3S 2200maH 40C Li-Po pack will get you this: 2200mAh x 40C = 88,000 mAh discharge rate 88,000 mAh / 1000 = 88 Ampere constant discharge rate.

So, a 2200mAh / 40C Li-Po can only handle an Ampère draw of 88A at max. That's why the combination capacity/discharge rate is of such importance for selecting the right Li-Po for you project.

Example calculation of usage time:

Say your r/c model needs 3A from your battery.

With 1100 mAh battery, it needs 1100mAh / 1000 = 1.1 Ah. And then 1.1 Ah / 3 A = 0.36 h = 0.36 x 60 minutes = 22 minutes.

Please notice that current draw also depends on your way of playing or flying your r/c model and external factors such as resistance, weight and wind. Preferably, always use a Li-Po low battery warner device on your RC device. This will warn you when the battery is drained before it's fully empty (20%). Don't push the Li-Po. They don't like to get discharged to the bottom. And you won't like your airplane r/c falling down from the sky suddenly either.

Li-Po Battery Handling & Storage

Storing Li-Po is pretty straight forward. Keep them in a cool safe place where if there were a problem, it would be contained with little to no drama. Lots of people use an ammo can or a fireproof safe and keep them in their garage or shop. This will definitely work but there are many other solutions. Basically you are looking for several things, a usefully designed container, a place that stays cool and is away from flammable or highly combustible materials, and a plan.

First up is the container. There are a wide variety of containers that will work for this purpose. I would think any metal box that has useful dimensions and is relatively air tight would be the easiest and safest container to use. This could include tons of boxes including tool boxes, ammo cans, cash boxes, etc. The use of Li-Po sacks is a fine idea but I would not simply place your Li-Po in a sack and set it on the shelf. That would likely contain any heat/fire a Li-Po could produce but it won't do a very good job of protecting the Li-Po from getting damaged. As such I believe Li-Po sacks are fine for charging but storage still needs to be in a hard container. If one were overly paranoid, I suppose each Li-Po could be placed in its own Li-Po sack and then the sacks could be placed in a metal box. That would definitely cover all your bases but it would be difficult to use and very expensive. Whatever you decide to use, just make sure it is as useful as it is safe or you may not use it.

Next up is the location. The location needs to be out of the way and it needs to stay cool. A cellar would be ideal but a basement could also work depending on the type and use. Most people will use their garage or shop but that is not always the best place due to temperature fluctuations. Where I live, the southwest, garages and shops are like ovens in the summer and freezers during the winter. This huge swing in temperature can damage Li-Po.

In a summary, below are the summaries in storing Li-Po battery:

  • Keep Li-Po battery packs WELL out of reach of children. 
  • Do not put battery packs in pockets or bags where they can short circuit. 
  • Do not store or transport or store batteries where they can come into contact with sharp or metallic objects. 
  • Do not store your Li-Po pack in extreme temperatures below 0C or above 50C. 
  • Always store your Li-Po pack in a safe and non flammable container away from flammable objects. A Li-Po Sack or metal / ceramic storage container is best.
  • Always store your Li-Po partially charged. They will maintain their performance levels over time and there’s no need to cycle them unless stored for periods longer than 3-6 months. 
  • Always balance your Li-Po Batteries after use (ONCE COOLED). If you store a Li-Po battery uncharged it will be exhaustively discharged
  • If you don’t use your Li-Po for a longer time (>2-3 weeks) you should discharge it to approx. 50% of its capacity to store it (cell voltage approx. 3.85 Volt). In this state of charge the chemical decomposition is minimal.
  • If you store your Li-Po batteries for longer than 3-6 month you need to cycle charge your batteries.
  • Please refer to your Li-Po charger manual for cycle charge.
  • Never discharge Li-Po batteries below 3 Volt per cell. This will cause irreparable damages and makes your battery unusable. 
  • NEVER put Li-Po into the household waste! Dispose of Li-Po batteries responsibly.
  • Do not store batteries inside an automobile.
  • If you want to keep the connector of the Li-Po - NEVER cut the cables simultaneously. First things first. Insulate the cut ends using tape or heat shrink. A short-circuit can cause an explosion!
  • NEVER cut into an expanded Li-Po!
  • Keep Li-Po battery packs WELL out of reach of children and pets.
     

Transporting Li-Po

This is something a lot of people struggle with. Of course care needs to be taken to keep the Li-Po safe from damage while you move them around and if there is a problem, the Li-Po need to be well contained.

I believe those concerns are secondary to the fact that what ever you transport the Li-Po in needs to be well thought out and useful. This way it does not burden you while moving it or using it. In other words it needs to be both handy to use and fit in your car easily. I would assume that a great solution would be a metal toolbox. If done right it could have individual storage places for each Li-Po and also house your charging equipment. Plus if a Li-Po went off while inside, it would very likely contain the heat with little or no damage to anything around it. Whatever you decide to use make sure it is fairly air tight, has a handy internal setup and has a good latch so that if it is dropped, the contents don't come spilling out.

I crashed :( Is my battery still OK?

Everyone crashes, we've all done it and it's a part of the hobby. If you happen to crash an aircraft or helicopter or other model which is powered with a Li-Po, please approach the crash site carefully and be ready for the worst (burnt violently from the Li-Po).

Disconnect the battery from the ESC very carefully, and try not to touch the pack too much. If you can, move the pack somewhere out of the way and keep an eye on it for at least 45 minutes. Watch for swelling or softness on the battery surface and if any part of it heats up. As explained above, Lithium reacts (burnt) very violently with air.

The pack may have somehow been punctured in the crash. If the puncture is very small, it can take quite a while for air to work its way into the pack until it gets burnt violently. If the pack is swelled or puffed DO NOT touch the pack directly. The battery is definitely damaged and you should follow the disposal instructions. Also, if the pack is deformed or damaged in any way PLEASE DO NOT use it again and dispose of it carefully as per the instructions below.

If the damage caused an internal short, the pack will start building heat and it could go off/burnt/explode. This could take 2 seconds to 45 minutes. If the pack is getting hot then find a safe place for it, like a cleared off dirt area or a concrete pad, and leave it there. Pay attention to surrounding to. Do not put it near things that can get caught on fire.

If the pack does not go off in 45 min or so, then check it again and see if it has cooled down. If it is cooled down then it is likely safe but will need to be disposed properly. If it sets off then let it burn down and once everything is cooled off, just toss the remnants in the trash.


Dealing with retired or damaged Li-Po

At some point you will have a Li-Po that either becomes useless or becomes damaged. You need to understand how to handle a damaged Li-Po and how to dispose of it.

How do you know your Li-Po is bad?

This question can sometimes be very easy to answer and other times not. If your pack is folded in half from a crash then it is most definitely bad. But if it looks physically fine and just doesn't perform well, the question is not as simple to answer. First let’s cover what makes a Li-Po bad in terms of physical conditions and then we will cover other reasons a Li-Po should be retired.

Anytime a Li-Po has been physically damaged there is a very good chance it damaged beyond use. If any cell in the pack is punctured, crushed or badly swollen, the pack must be considered damaged beyond use. If any of the wires become disconnected from the pack then most people should discontinue using the pack.

Now what about packs that look fine but shows signs of other problems? This is my one-liner on the subject "If a battery is no longer able to perform the task it is intended for, it needs retired.” A Li-Po can fall into this category for many reasons including age, a bad cell or just worn out. It could also have been damaged by heat, over-discharge or being shorted out. All these things can leave you with a battery that looks fine but just doesn't perform as needed.

Dealing/handling a damaged Li-Po

So what do you do with a Li-Po that has been damaged, either in a crash or somewhere else? Let me just go through a few scenarios to show what I would do and then you can take it from there.

Accidental cut a Li-Po while working on your model.

Say you are working on your r/c model and you accidentally nick a Li-Po pack with a razor knife. Take the pack outside and place it somewhere safe. If you want to drop it in your metal wastebasket for the trip outside, that is fine. I would expect the pack to be toast so make plans to dispose of it properly. If you cut it and the pack starts to hiss and smoke then do the best you can at getting it somewhere non-flammable like a metal wastebasket or even on the concrete floor in the garage and then try to get it outside. (The best way is start working on your model in safe area).

Left a Li-Po in your hot car and it puffed.

Puffed Li-Po are not dangerous as long as they stop puffing. In other words if you find that one day your Li-Po is in the shape of a sausage, but it has not burst, it is probably safe but needs to be disposed properly. Leaving it somewhere non-flammable is probably a good idea.

As you can see I follow the simple idea that if a Li-Po is damaged and I am scared of it at all, I take it to a safe place where if it does escalate into a bigger problem, no damage would occur.

Also please read the procedure for disposing Li-Po battery later in this article.

What to expect when a Li-Po "goes off"

Ok say you crashed your model and the Li-Po is getting warmer and warmer, what could you expect if it "goes off"?

First let’s talk about the Li-Po you have probably seen the YouTube videos, where they explode into 2ft fire balls. Those are deliberate failures done to get the most "bang for the buck" out of a Li-Po. In other words the pack was purposely overcharged until it catastrophically failed. The only way to have reaction like that is to overcharge a pack for a long time. I suspect it takes upwards of an hour of overcharging to get the pack to build up enough heat in order to fail like that. This type of failure was more frequent on early Li-Po and chargers. Usually someone would set the charger to the wrong cell count and then would leave it unattended only to later find their garage on fire. This kind of failure is very rare these days and is almost never representative of what a crashed Li-Po looks like when it goes off. However it still could happen under normal circumstances. That is why if I may remind you again, be very careful in handling things that involve Li-Po battery.

Now let’s talk about what usually happens when a Li-Po "goes off". This is the kind of failure you could expect from a physically damaged Li-Po, like one that was crashed and suffered a crushed end. First thing that will happen is the building up of heat. Li-Po need heat to set them off and one way this happens is from an internal short caused by crushing a pack. This build-up of heat could be very rapid or fairly slow, depending on the damage and the state of charge, but if it gets hot enough it will it will go off. When this happens it will rapidly expand the foil covering on the cell that is failing until it pops...

Ok let me stop for a second and explain another concept. When a Li-Po "goes off" it is rarely, if ever, the whole pack. It is almost always one cell at a time. This means a 3s Li-Po could "go off" 3 times before it's all done but each time it does, it is a less violent reaction.

Once it pops smoke, it will start to poor out. You may or may not see fire. There is case that Li-Po does not set fire, only smokes. This does not mean there is no heat though; it was measured 750 F / 400 C smoke coming out of it, so it is indeed very hot. Li-Po will rarely move around or spin when it goes off; they just sit there and spew smoke. But there is also case where fire or Li-Po shoots across the ground as they go off. Remember that the smoke could be toxic. The total reaction can last a few minutes per cell and the resulting pile should be a combination of ash covering many thin metal sheets like aluminum foil.

If a Li-Po goes off in your r/c model before you can get it out, expect it to do some pretty good damage. It is recommended that you do your best to get to the r/c model quickly and get the Li-Po out ASAP, with great caution.

Li-Po battery disposal

  • In order to properly dispose of a Li-Po battery, you must first discharge it as low as possible. However, if the battery has been damaged DO NOT discharge it, just proceed with the next step 
  • Fill a bucket or some plastic container (NO METAL) with water, and add salt. Add approximately 1/4 cup of salt for every liter of water. The container may have a lid but must not be air tight 
  • Immerse the battery in the salt water fully. Make sure that even the power connectors are submerged. Leave the battery for at least 2 weeks. 
  • After 2 weeks, remove the battery, wrap in newspaper and dispose of in rubbish bin like normal rubbish but follow your municipal battery disposal guidelines.


Reminder Cautions

All the points above are “common sense”, but…

Please take special care of the following points as explosions and injury are easily caused especially for UNAWARE NEWCOMERS and INNOCENT THIRD PARTIES.

  • SWELLED LIPOS: Never charge a Li-Po pack that has ballooned or swelled due to over / under charging or from a crash.
  • SWELLING: If you notice your Li-Po battery pack is swelling, stop the balancing process (charging) immediately, put the battery in a safe container (metal/ceramic) and observe it for 45 minutes with caution.
  • DAMAGED LIPOS: Never charge a lithium polymer battery pack that has been punctured or damaged in a crash.
  • OVERCHARGING: NEVER overcharge a Li-Po battery.
  • LIPO CHARGE SPECIFICATIONS: Always follow the battery specification printed on battery pack when setting up the charger. If no specification can be found, contact the manufacturer of the battery before you attempt to charge/balance. A high charge setting can cause the battery to explode, ensure you balance your battery at recommended voltage.
  • CHARGE SURFACE: Always charge Li-Po batteries on surfaces that won’t catch on fire such as cement, steel, ceramic or stone. Wooden tables and carpeted floors are not recommended charging surfaces. Fast charging can cause a battery to reach temperatures of up 70 degree. It is recommended to use chargers with external temperature control.
  • COOL LIPOS: Allow the Li-Po to cool down before charging.
  • POSITIVE & NEGATIVE WIRES: Never, under ANY circumstances let the positive and negative battery leads touch. It can lead to cell ballooning, cell damage or fire or an explosion.
  • Do not immerse the battery in water or allow the battery to get wet. 
  • Do not short circuit the battery. 
  • Do not pierce the lithium polymer battery with a sharp object – it will lead to ignition or an explosion. 
  • Do not short circuit the battery. 
  • Do not puncture the battery as it can get burnt or explode straight away.
  • Do not solder directly to the battery. 
  • Do not hit the battery with a hard object such as a hammer or rock. 
  • Do not dispose of in fire or heat. 
  • Do not use the battery with the positive and negative terminals reversed. 
  • Do not disassemble or modify the battery. 
  • Do not fully discharge your Li-Po battery pack. Discharging a Li-Po beyond its critical minimum voltage (often 3.0v) can cause damage to the battery. 
  • Do not breathe in the smoke fumes of a Li-Po battery that is on fire. They are toxic. 
  • When mailing or shipping Li-Po batteries, always ship them at a 30% charged state for safety reasons.
  • When storing batteries for extended periods, store at a half charged state. 
  • To dispose of a Li-Po battery, discharge it fully then place it in a bucket of salt water for two weeks. To dispose of, follow your municipal battery disposal guidelines. 
  • If your battery becomes damaged, do not place it on a flammable surface – it’s possible that a chemical reaction can take place which could cause a fire. Put the battery in a safe and non flammable place and observe it for at least an hour. 
  • If the electrolyte in the cells gets on your skin, thoroughly wash with soap and water. If it gets in your eyes, rinse thoroughly with cool water and seek immediate medical attention. 
  • Finally, always follow the manufacturer’s safety instructions and charging guidelines for lithium polymer battery packs and use your common sense.

 

 

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