RE: 6.0V battery on JR charger
generally the wall wart chargers will charge a 6 volt pack, but at a reduced rate. sometimes the led therefore is very faint or not lit at all. I have measured my chargers, and they put out about 45 mA to my 6 volt packs. This means it will take at least 24 hours (1100 / 45) to charge your 1100 pack.