I can't recall what a glass-enclosed device is called which I think is a
capacitive component with resistance.
This component shows 11k ohm resistance and no difference in polarity, and
checks equally the same with a DMM diode test.

This just looks like a small axial lead glass diode (~3.8mm long) without a
cathode mark, copper colored dies at each end with a tiny gap between them.

The pack has three external terminals, of course (+) and (-) and a 3rd
sense/charge terminal.

The component's place inside the battery pack is between a third external
terminal and joined at a junction with the external negative terminal.
The battery negative battery contact is connected straight to the external
(-) terminal, and this device is between the negative terminal and the 3rd
external contact.
(not too swift at ascii art).

Thanks

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Cheers,
WB
..............