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Slight swelling on battery

eligri

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Hey'a!

Got back from my first flight in a long time with my Mavic Air (1). Noticed the battery was a bit warm (not like HOT, but certainly warm) and perhaps a tad bit swollen. Not golfball swollen but a little swollen.

Is this normal? Can't remember if they always did so. Most of my airplane batteries do, but unsure if my DJI batteries did.

Attached pictures of swelling, taken 5-10 min after flight (about same level of swelling as instantly after).

Was informed that it was normal to have slight swelling, but to keep an eye on it just to be safe.
 

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MAvic_South_Oz

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Has the swelling gone after it's completely cooled ?
If not, then I'd be a bit worried about using it, both from a cell voltage perspective, and from the swelling causing the battery to potentially eject in flight.

I'm not 100% sure if that seemingly minor cell deviation is something to worry about, others might know.

Flying the drone hard, climbing a lot (up and down), in sports mode, or in high wind can make it work a lot harder, draw more current, and cause batteries to heat / swell more.

I would probably test it if the swelling has gone, and take it easy for a flight or two.
If it's a concern, retire it for flights and just use it on the ground for updates and setting changes etc.
 

eligri

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Has the swelling gone after it's completely cooled ?
If not, then I'd be a bit worried about using it, both from a cell voltage perspective, and from the swelling causing the battery to potentially eject in flight.

I'm not 100% sure if that seemingly minor cell deviation is something to worry about, others might know.

Flying the drone hard, climbing a lot (up and down), in sports mode, or in high wind can make it work a lot harder, draw more current, and cause batteries to heat / swell more.

I would probably test it if the swelling has gone, and take it easy for a flight or two.
If it's a concern, retire it for flights and just use it on the ground for updates and setting changes etc.
I'd say the cells are pretty balanced, atleast compared to other lipo's i've owned.

The battery might still have a slight swelling, hard to say. But certainly not enough to eject it mid-flight. Talking a millimeter deviation, at the most.

Won't be doing any ground work or buying new batteries, I use this drone very seldomly. Mostly just want to know if I need to be very cautious or not :)
 

dave canada

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Keep an eye on it if one cell goes bad in it, it will cause a problem and usually only one time but the craft will most likely need repair
 

eligri

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Keep an eye on it if one cell goes bad in it, it will cause a problem and usually only one time but the craft will most likely need repair
All cells seem decently balanced and no noticable voltage sag. Not talking major swelling for a Lipo here, just a little chunky perhaps.
Ill fly it carefully next time and check if swelling is noticably worse.

Cheers
 

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