I am thinking about buying one of these from eBay. Does it change my overall charge time? Will it harm my batteries?
http://www.ebay.com/itm/Multi-Batte...182?pt=LH_DefaultDomain_0&hash=item43df607036
http://www.ebay.com/itm/Multi-Batte...182?pt=LH_DefaultDomain_0&hash=item43df607036