Lithium Ion battery

[sayzer]

Hi Nick,

Check this post and ask PEU how he made it.

http://www.picbasic.co.uk/forum/showthread.php?t=4782


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[Nicmus]

Hi Sayzer,
Thank you for your input.
My project has to do with a battery which has the built in fuel gage.BTW it can be any 3.6V- 14.4V battery.
From what I understand reading voltage only on this kind of batteries is not accurate especially when your load fluctuates. The built in fuel gage takes in account a lot of factors (charge/discharge current, cells and pack voltages, temperature, age …) which can influence the “real” remaining charge and compensates for that.
What I want to do is to use this information already available and more precise then anything I can built and hopefully with a PIC 12Fxxx and a bi-color LED to identify five 20 % steps (green, umber, red and blinking green, umber, red).
It is also my understanding that the smart batteries come in two flavors when you try to communicate with them:
- 1 wire interface
- I2C interface
My flavor is the I2C and what I’m looking for is some info on how to talk to the battery (what to say, what address to read and who says what and when).
Thanks again and I’m sure with this forum resources we can get somewhere.
Regards,
Nick