Eachine EX4 (JJRC X12) battery expanded issue

J

jim4b

Member
So my Eachine EX4, (also as JJRC X12), drone was last used back in September of last year, 2020 and it was in the case in my house at room temperature stored safe. But when I just got the 2 batteries back out to charge them, one has expanded so much that the battery case pushed off the bottom cover piece. Also I can not force push it back in to be able to close it as it was originally. Which then makes the battery not usable. Is there any way to prevent this issue, or has the maker created a design fix to correct this? So I want to sell this drone with 1 battery, extra propellers, case, and all the paper work instructions and so on included. It cost me total $252. with shipping and tax back on 7-25-2020 with 2 batteries and a case. Make an offer? I live in the western Washington area. Okay thanks.
 
Thinking on the low tech side, you could try lowering the temperature of the batteries when storing them. Put them in the refrigerator part of a refrigerator.,That may or may not work.
 
jim4b said:
So my Eachine EX4, (also as JJRC X12), drone was last used back in September of last year, 2020 and it was in the case in my house at room temperature stored safe. But when I just got the 2 batteries back out to charge them, one has expanded so much that the battery case pushed off the bottom cover piece.
Click to expand...
Whenever you have a battery "swollen", throw it away. Do not use it in any shape or form.
Providing 2 excerpts for references...............
excerpt " The bloating is evidence of explosive gas building up inside the battery."
excerpt : re Swollen Lipo Batteries Dangerous?
Yes. Next question.
Seriously, there are so many examples of puffed batteries that start on fire that this shouldn’t even be a question.
That doesn’t mean that every battery that is puffed is going to explode as soon as you use it but it does mean that a high enough percentage of them are going to be dangerous that it isn’t worth the risk.
 
Yah storing at slightly lower temps can be an okay strategy but even at room temp good cells should* be fine for quite a long time, Jehu Garcia a guy who refurbishes/rebuilds cars to make them electric has done some tests on 18650 cells that have sat on a shelf for years. I myself have had some batteries that survive long enough to get puffy but basically over discharging the cells or leaving them on the shelf either fully charged or fully discharged is bad for them, you want to be somewhere right in the middle (think 3.85V per cell is typical "storage charge" for chargers that have the option to put your cells at the right voltage for long term storage).
 
One thing you want to avoid is having any sort of condensation build up on/in the cells so don't want them to go from freezing to warm humid environment or really just don't want to freeze them entirely. The condensation can cause things to short out or just accelerate corrosion of metal contacts (probably other bad things).
 
Okay and thanks for all the helpful information. So now I will bring my bad swollen LiPo batteries into a local recycle place for safe disposal. For my other drone which is a MJX Bugs B4W bought last August, I have not yet had the time to actually fly it, but I did charge both batteries. So when we reach the end of the flying season this summer, I will try to be careful doing the last charging to get them to middle charge range. There are 4 green lite bars on that battery charger with 4 steady green as fully, so maybe charge only to the 3 bars green point will work. I did order a fireproof lithium polymer safe bag container that I start using. Which type batteries do smart phones have, LIPO or lithium ion?
 
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