Why do LithIon battery have three contacts?

Discussion in 'Off Topic Chat' started by IsaacG, Jan 19, 2008.

  1. IsaacG

    IsaacG TPF Noob!

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


     
  2. jstuedle

    jstuedle No longer a newbie, moving up!

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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.
     
  3. ferny

    ferny TPF Noob!

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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.
     
  4. IsaacG

    IsaacG TPF Noob!

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    @jstuedle: Thanks for the useful, informative reply.
     

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