Sure, why not.

Check sources of BNF scripts (the part responsible for using with bq27x00_battery, not the raw i2c access one) for exact location of sysfs entries with that data.

Actually, thinking about it, I would prefer this over the "out of hat" standby time (haven't thought about it earlier, as I use BNF for detailed info, anyway). If you ever code it yourself, be sure to send patches to CSSU. If,in the meantime, you would be able to fix that damn glitch with using design capacity to determine which icon graphic to show, it would be great, too

/Estel