Japanese carrier Willcom has hooked up with Sanyo to show off a back-to-basics handset powered by a single AA battery -- one of Sanyo's own Eneloop rechargeables, naturally -- that still manages to serve up 5 hours of talk time and 250 hours of standby. Just how back-to-basics are we talking, exactly? For starters, the phone lacks a display, pretty much ending any hopes of using this thing for gaming, video playback, or seeing who the heck is calling. In exchange, though, you get power versatility that's pretty much unmatched by any other phone on the market and an array of nodules that gently massage the side of your face while you're trying to hold a conversation. Between the perfectly round shell (looks like an AA battery, get it?) and the fact that it'll only get down with PHS networks, we hope this sucker goes through a few revisions before it sees production -- but we like where Sanyo's head's at.

We'll sheepishly admit to being among the reported 20 percent of cellphone users whose phones conk out at least once a week (in fact, it just happened today), so you can bet we'll be first in line to pick up one of Energizer's new AA-based cellphone chargers when they hit stores on September 1st. Eschewing proper spelling for catchy branding, the Energi To Go line will come in numerous configurations to support a claimed 100 handsets covering most major manufacturers, with each package containing a special tip for individual models. Energizer promises that its e2 batteries will enable most dead phones to make a call in just 30 seconds (you can use regular alkalines, but of course Energizer recommends its own pricey products), with smartphones requiring several minutes to suck up enough juice for calling. Along with the $20 cellphone version, Energizer will also be releasing a $30, four-battery model to charge DAPs and portable gaming devices, with iGo-developed tips available for iPods, PSPs, Nintendo DSes, and other small gadgets you see mentioned with regularity on these pages.

[Via Mobiledia, thanks Ryan]