The flashing orange light means that the battery is charging. When they give up, they do so quickly and indeed they can cook if plugged in for a long time with no power being drawn.
That means they can short or cause a short. Them really disturbing thing in Swa's case is that with no battery in, there is no boot up which indicates damage to the mainboard.
I think you need professional help here.
Suspishio
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