NFC . I asked your question on #maemo a week or so ago and joerg_rw advised to ignore what hal reports and even if it says it is 85% charged, the truth(according to him) is that it is 100% charged. I know it is irritating to have 7 bars left 20 minutes after you disconnect the charger, but it seems that is how BME works.

Maybe we should push harder and finally get rid of that piece of crap (BME I mean)

https://gitorious.org/hald-addon-bme/hald-addon-bme
https://gitorious.org/libbmeipc/libbmeipc