Battery question

[VpnDrgn]

I recently took the skin off of a 17670 batt to see if it would fit in a mod.
It may be my imagination but I thought I heard a slight sizzling/crackling
sound when I slid the batt in and it's metal sides made contact with the
metal of the mod, and when I yanked the batt back out it felt very slightly
warm. I say my imagination because I realise I am paranoid about li-ion batts.

My question is - does the outer skin on a batt serve as some kind of
insulation? I recently read a post about a tube mod and the pictures
showed a stripped batty.

Does anybody know?

 

[SubGothius]

AFAIK, the outer shell of batteries are typically negative or more rarely neutral. Mods that use the casing as a circuit path usually treat the casing as a Negative terminal for this reason.

 

[Java_Az]

Protected batteries have a positive strap going to the protection circuit on the outside of the battery. It is insulated from the ground with a thin piece of tape. Here is a picture of a battery with the outer covering taken off .

 

[VpnDrgn]

So the housing on the mod was shorting between that strip and the housing on the batt.

Thanks