Why do LithIon battery have three contacts?

IsaacG

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Just wondering... why is it that LithIon batteries got three contacts?
 

jstuedle

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Li-ion batteries if over charged or charged too rapidly can catch fire. The third contact is for the charger to monitor charging rate and charge state.
 

ferny

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Maybe no-one likes them. Or they've only just opened their Facebook account and they haven't told their friends.
 
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IsaacG

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@jstuedle: Thanks for the useful, informative reply.
 

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