Battery is made of the best high capacity cells from Japan with an actual capacity of 1,150 mAh. Informations about the higher capacity of the battery, 3000 mAh or more, provided by other sellers is nothing more than an unfair marketing trick. The actual capacity of These batteries is not higher than the genuine Sony NP-FZ50 product. For example a standard notebook battery has the capacity of 4,000 mAh. That shows it diemensions of smaller camera battery simply not allow it to put more than 900 mAh in it. Newell Batteries are manufactured using the Li-Ion battery technology. These batteries do not have the memory effect and the charging them is possible without previous running down. Buying Newell battery you have the guarantee your camera is safe. The 40 months warranty on the new battery included! Each battery is well Newell blister packed and has a blank cover as a protection.