Document with answers to most popular battery-related questions is ready

Paul Fertser fercerpav at
Sun Aug 2 21:22:40 CEST 2009

Wolfgang Spraul <wolfgang at> writes:
>> To me it seems that CC readings are almost unused except for
>> presenting the user with a bit more accurate capacity data. And when
>> someone is developing something lowlevel he could as well connect and
>> external ampmeter, much more reliable and flexible approach.
> Now, if an accurate way to measure the current in the device solves 80% of that
> as well, then the (big) extra cost of supporting CC batteries is not worth it.

Yes, i think that's the case. The only state where integrated power measurement
readings are unavailable is suspend and that's quite low level

> So for me it all comes down to precision. Is it possible to build a cheap and
> accurate way to measure current in the device?

bq27000 measures current accurately so it should be possible. I'm sure
there's some decent IC suitable for your task.

Be free, use free ( software!
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