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Q&A

Comments on Why did the battery blow out?

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Why did the battery blow out?

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I have a bed for which the headrest can be adjusted. There are 2 separate power inputs for each side like in the picture:

Image_alt_text

In addition, there is a set of 9V batteries on each side, presumably for backup:

Image_alt_text

Yesterday I heard a loud bang and found one battery on the floor:

Image_alt_text

By looking at the battery, is it possible to determine what happened to it? There has been no water damage or anything else I can think of. The batteries were old, I don't even know how old. Is this a normal failure mode for old batteries?

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1 comment thread

Chemistry? (1 comment)
Chemistry?
Lundin‭ wrote 2 months ago

Was there any printing on the batteries that gave hints about the chemistry? Maybe they weren't regular alkaline, maybe NiMH or NiCd although those are relatively safe too. Lithium chemistries are more likely to get a thermal escalation and go out with a bang in case of a short (caused by dust etc) or in case the BMS failed, but it seems like an unnecessarily scary fire hazard to use such chemistries underneath a bed.