Possible Duplicate:
Why we have 3 pins on some batteries?
I'm trying to build (DIY) open charger for mobile battery. I would like to know what is the usage the middle one?
Is there anyway I could check the status of battery (i.e., charged to max)?
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2\$\begingroup\$ Duplicate of http://electronics.stackexchange.com/questions/10588/why-we-have-3-pins-on-some-batteries ? \$\endgroup\$– MikeJ-UKCommented Mar 7, 2012 at 15:49
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