With exception of the Quester (which runs on 4 AA batteries), all devices are equipped with internal rechargeable batteries. 

A full 4.000 mAh battery should provide roughly 16 hours of gameplay, depending on use & configuration of the device.

As these batteries are inside the device, we recommend charging them at 0.8 amps, (1.2 amps maximum), to avoid overheating. 

Battery conditioning

Prior to the 1st use of the devices, you need to condition the battery, just like a cell phone battery. That means:

1. discharge the battery completely.
2. once the battery has been discharged, charge it again.
3. discharge once more
4. charge again, and start playing

After gameplay, you can just top up the battery, no need to fully discharge it first