[ICOM] Insert for BP3 battery pack

[Steve]

I recently bought an insert for the BP3 battery pack I use with my IC2AT.

Started to unsolder the old battery pack from the BP3 and notice that it 
has a two-terminal component wired between the sixth and seventh cells 
(counting from the positive terminal). The component is metallic, 
rectangular, has a plastic sleeve around it and is taped such that it 
lies against the sixth and seventh cells.

Wonder what that component is? Is it needed with the insert I bought? I 
don't see a similar component in the new insert.

The old battery pack with the two-terminal component is the original 
that came with the IC2AT in the 1980's.

Thanks.

Steve
K8JQ