With stock bme, new applet seems to use last_full, not design capacity. I have a 10 cycles.old BL-5J, design capacity 1415, bq27200 calibrated capacity of 1515, and bme last_full of 1215.

We all knew the mAh values reported by bme are more or less made up. The applet seems to report different percentage values than bme. bme will happily report a percentage that arithmetically doesnt add up with reporting.current/last_full or /design... For compatibility with old applet, using the percentage value reported by bme would probably make more sense.