Game Boy Advance Sport Shell Hard Case! When you?re hauling your Game Boy Advance from location to location, you can risk it in your backpack or pocket, or you can go with the guaranteed protection from this rugged, hard case. We think this is a no-brainer. There?s enough room in the multiple compartments of this case for your Game Boy Advance or Game Boy Color, four games, batteries and cables.
For Lithium battery expansion board:
Battery capacity: 3800mAh
Maximum output current: 1.8A
Output voltage: 5.1V ± 0.1V
Standard charging current / voltage: 1.2A/5.0V
It's convenient to power on / off raspberry pi via battery swith;
It can last about 9 hours if only pi 3.
The Lithium battery expansion board can be also used on cellphone.
Note: You can still charge this battery even if the switch is turn off;