2x questions to those with dual batteries: Using a Nokia 1A AC charger (not dk-frosts external charging setup) how long does it take to get a full battery? I was wondering because if the charging profile tapers off and having double the capacity wouldn't that add significantly to getting a full charge? Sorry if it's been mentioned before and I've missed it. Also, has anyone checked for cell balance after a significant period of use? My main concern.. TIA