Well, the Zaurus and the PSP use the same size power connector, so I gave this thing a shot. It's a pretty small, 3600mAh battery. Seems to work just fine, but I haven't given it an extended test drive yet. My Zaurus hasn't exploded yet, so that's a good sign...
Among other places, you can get it here:
http://www.price88.com/product_info.php?pr...3016&tc=FroogleOr here:
http://www.baysoftgames.com/powerbrick.htmlI found mine at the local GameStop.
It's hard to tell, but judging by the size and weight, it's probably a lithium-ion battery. NiCd batteries at that size tend to have a much lower life, but ya never know.
EDIT: The back of the battery says 3.6 volts, which is common for radio-controlled cars, which tend to use NiCd/NiMH... also, it
does seem a little too heavy for Li-ion, but I wouldn't really know. The brick does get a little hot at first, but after having it plugged in for five hours it was pretty cool, so I suppose it charged all the way and shut off. The only indicator on it is a small LED that flashes when it's plugged in.
Checking the voltage with a... volt-checking thing... it outputs 5 volts, just like the regular power supply. It gets a teeny bit warm where the cable-to-PSP (or Zaurus) plugs in, so maybe it has a circuit to step the voltage up?
EDIT AGAIN: Oh yes. The brick is designed to use the standard PSP AC adapter. The Zaurus one works fine, and I'm actually using one for an iPAQ. Also, the PSP's battery is 3.6 volts, and charges at 5 volts; it's quite possible that the Power Brick's battery is a standard 3.6 volt Li-ion with the voltage stepped up. Which'd be nice, because I don't really like the whole "full discharge" thing with NiCd, and there's no way to tell how charged up the brick is.