"mike" wrote in message
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On 11/14/2017 11:22 AM, Ian Field wrote:
Just curious about the failure mode - the cells really weren't worked
that hard.

Thanks.
You're gonna have to be a LOT more descriptive about the 'pack'.
passive/active/protected?
What did it power?

Just a bare 2P 18650 pack powering an e-cig with a 1 Ohm coil.

The only electronics is a power MOSFET where there used to be a microswitch
for the fire button.

Charging is controlled by a shunt regulator, there is a feed SB diode so the
shunt failing short can't harm the battery.