Battery selection airsoft 11.1V Li-Po. This type of battery offers several advantages, the first being responsiveness, your reply will react almost instentanément when appuirez the trigger. Then it is more compact will be less complicated to install it on your replica. The duration of use at the same amperage with NiMh battery is higher, almost 2 times more autonomy, which is not negligible!
Note however that the battery does not fall below 30% load, only weak battery. It is necessary to use a battery charger designed for Li-Po batteries.