Dead JBL speaker and melted PSU. Which died first?

This little rechargeable JBL speaker was sent in by Leo. During use it had suddenly stopped working and the PSU then showed signs of melting.

Other thoughts to add to the video are that the battery voltage of just above 3.3V suggests a low dropout 3V regulator was involved and prevented the lithium cell being discharged below that voltage. The lithium cell also has a DW01 chip and MOSFET pair protection PCB on it.
The meagre 500mAh lithium cell seems a bit mean. Maybe they were trying to save space for acoustic reasons, but it compromised on run time.

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