>
>
> iirc some of the stuff in lithium batteries as pretty explosive even
> without something to react with.


I know people say they "explode", but I've always held that to be a boiling
liquid "explosion" when the vent fails.
This was a definite "BANG", which threw sparks.  Happened in several places,
notably where a lot of black "crud" had built up, in the vias, and between
the pins near VCC on the SRAM.  Some of them were address lines to the SRAM,
definitely NOT where any cap would exist to store up energy.
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