Yes a bug has been raised and it is not a bug... See https://bugs.maemo.org/show_bug.cgi?id=7636#c16 As a summary battery charge percentage is current capacity divided by DESIGN capacity. Thus it is a feature it never reaches 100 %. Instead, a new battery at 60 % will last as long as say a 2 years old battery that can only reach 60 % at full charge lasts from that.