Using a D90 battery grip is placed in a (cheap). On the original battery Nikon is written 1500mAh capacity. 1250mAh on it so a little less, whatever. There must not be any electronic chip inside as in the D90 menu displaying information on the number of battery picture still remains at 0. Anyway, since these 9.99 euros, the price / quality ratio is excellent. It will be my second backup battery. For now I only use this no-name battery for the test and it seems to be in terms of capacity. We'll see with time if it will always be the case ... It is a very good buy.