converted my wireless PS2 pad from 2xAA batteries to an internal 3.7V battery pack and a USB charging circuit
however I didn't quite plan this well enough and there's no sensible place to lead out the microUSB socket so... it's just kind of dangling freely inside the thing for now
@theoutrider that's still really cool though
@Shadejackrabbit moreso because the fuckin thing eats AAs like nobody's business AND is too greedy to run well off rechargeables (which only output 1.25V rather than 1.5V)