The batteries are announced as 1200mAh (ie 30h of use), in fact it is 700 mAh battery, much less than 30 hours without recharging. This probably explains the other comments that the batteries do not hold a charge. Note that the 700 mAh battery is contained in a plastic packaging indicating Yet although it is 1200 mAh battery / 30h. Bizarre, weird!
Anyway if you want a battery 1200 mAh, go your way.