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Old 10-11-2012, 10:48 AM   #22
knc1
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Location: Central Texas
Device: No PW2, KV, KOA
Ah, the topic question:

Those extra battery terminals **should** be I2C - -
But since the device uses an external battery management chip (on one of the SPI buses), then it is unlikely that the battery includes a battery management chip.

Most likely, that I2C connection is just the battery temperature sensor.

That is because to "properly" charge Li-Ion, the battery temperature changes have to be monitored to detect "full charge" condition (you can't use terminal voltage detection to reliably re-charge Li-Ion).
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