Even with today's wireless video game controllers, you can't stay untethered forever. After a few hours of gaming on the PlayStation 3, you'll have to plug in that SIXAXIS or DualShock 3 USB cable to charge. Starting December 18th, Sony Japan will offer an AC adapter intended for PS3 controllers at a price of ¥2,800 (just under $30). Like third party solutionswe've seen, it has two USB ports so you'll be able to do two controllers or toss in a Bluetooth headset. Nothing yet on availability outside of Japan, but if we get word we'll be all over it, 'cause we feel slightly guilty for leaving the PS3 on overnight to charge -- what with the world's dwindling energy supply and all.