The battery is built in 2007. But that do not, the battery is probably lost in spite of the storage time not to capacity, the phone keeps back more than a week without recharging (I telephone very little). Contrary to some recessions spare batteries from other vendors, of this Wusar really is absolutely new, so it has no marks on the contacts, at a cost of about 5 euros an absolute snap. Supplement 13.09.2011 After less than six months of battery breaks, holds only 2 days the actual age is now well yet, shame on the other hand for now under 4EUR I buy a halt again.