I'd like to know where to buy similar batteries (Li-Ion) like used making Raspberry Pi Portable, and charger for them.
While I am at this, can I use my battery powered device while the battery is charging?
Also, making own gamepads, is it better to make buttons like in real gamepads (with rubber buttons) http://www.slagcoin.com/joystick/pcb_wiring/beginning.jpg, or use push-buttons like buttons http://s4.electrodragon.com/wp-content/uploads/2013/07/20PCs-Stand-90-Degree-Side-Pin-TACT-Push-Button-6-6-8.jpg which are easier to get hands to?