Question: Extra contacts on Lithium-ion batteries

S

steved

Guest
Can anyone tell me what the extra contacts are used for on flat pack
lithium-ion batteries? I'm trying to jury rig a charger for a spare battery
for my iPAQ. The charger works fine on a similar 3.6 volt lithium battery
from an old cellphone, but does nothing when connected to the iPAQ battery
in the same way - directly to the plus and minus tabs.

I'm guessing that the additional two tabs on the battery are involved in
the charging process in some way.
 

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