Alt text: picture of a Costco mechanical fish (cat) toy taken apart.

I had one of these fail last night from the battery lead coming off as pictured. That is something I expected. Upon opening the mechanism, both sides of the lithium cell have very concerning damage in a piercing type of abrasion. The cell is relatively small.

Speculatively, I expect the stuffed toy is flammable, making this an ideal house fire starter if the cell gets bridged layers in the battery from a puncture and goes into a runaway state.

All it needs is a way to secure the battery with some double sided tape and extra insurance like some kind of soft filler fabric or material to stop it from rattling around. Maybe add a bit of hot glue to the battery leads at the circuit board to insure they do not fail from a lack of strain relief.

I haven’t retraced the circuit, but the battery looks fine otherwise. It appears to have a DW01 like protection board at the cell, and a 4054 batman according to the silkscreen.

battery damage closeup image 1 on catbox.moe battery damage closeup image 2 circuit board close up image 1 circuit board closeup image 2

This is a serious issue that should not be ignored.

  • al177@lemmy.sdf.org
    2·
    9 months ago

    An alkaline AA may have more capacity, but the LiPo has lower internal resistance and it’s electrolyte is flammable. The worst the alkaline would do it shorted or punctured is get warm and poop out KOH.