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Swollen battery or not?

pinzmann

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I have a mini 2 battery that is somewhat tight when I insert it into the drone. The other 3 slide in easily. Holding it doesn’t feel any different from the others. Voltage is balanced and it has 23 cycles. Battery is 15 months old. Should I be concerned?
Have no experience with swollen batteries. Well actually I do but those were battery packs for airsoft guns , I think.
 

Phantomrain.org

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One of the threats of the swollen battery is that as it heats up pop and disconnect and your drone will drop to the ground because it lost the battery power.

Best thing you can do is to trash the battery properly as they can explode like a smoke bomb. Been there !

Phantomrain.org
Gear to fly your Mini 2 in the Rain. Land on the Water.
 
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FlyAMR

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I have heard that they should be stored in the refrigerator or freezer for 24 hours which should cause them to completely deflate .. but I have never tested this system.

I recommend STORAGE every time you are done flying or if you are not going to fly the same day, bring the cells to 3.85 volts
A lot of times problems like yours happen because you store charged (or too low) batteries for days.
 

cheddar-man

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Just let the battery do what the manufacturer has designed them to do, self discharge to around 96% after one day idle and 75% after 9 days.
Gas generation in lithium ion batteries is a normal thing. Even if you don’t abuse your battery, the normal everyday use of your battery will generate gas through a process called electrolyte decomposition. This decomposition occurs even faster if you overdischarge a battery or overheat a battery. During the decomposition the electrolyte gives off oxygen and it is this which causes the battery to swell. Anybody with a modicum of physics understanding will know that oxygen, in excess is DANGEROUS and with the right conditions HIGHLY COMBUSTABLE.
Dispose of a swollen battery in the correct manner, DON'T use it or play with it, it is not recoverable.
 

cheddar-man

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Now I have another question. I have 2 drones and I keep the batteries with the drone stored in a heavy plastic case.
Should the batteries be stored separately?
Theoretically, yes, just in case one does decide too combust. Must admit my three batteries are kept in the supplied storage/charging unit. When I'm going to fly I just put the unit on charge and it will top up the batteries ready to fly.