battery voltage

Since I still don't have all the materials for my wii portable project, I decided to mod my Wii remote to use a 18650 battery i had laying around from a broken laptop. The battery was about half charge (measuring 3.5v on a multimeter) and so far, the wiimote works flawlessly (no overheating or...

(Sorry to remove all context from this thread but coming back to this forum, to put it simply... I'm embarrassed to leave such a stupid question up, especially with the backlash it got. Start fresh and all that).