"24000mAh" External Rechargeable USB Battery Pack for PSP/NDS/DS Lite/GBA/MP3/MP4/PDA

Pros: + Has an on-off switch (or a NO OFF switch as the package says :p)
+ indicator light for charging or discharging
+ pocket sized (nice and compact)
+ Can charge any device with a USB charger

Cons: - Needs PSP adaptor to charge itself
- indicator light is only one colour
- doesnt come with a case
- button is a little hard to move (a little too small for my liking)

Other: If you need a general purpose backup battery this works well, you can charge virtually anything with USB and its capacity (2500mAh) is not bad for US$17. Due to its size and you can use any USB charging adaptor I'd recommend it over SKU.08163.
(I use SKU.5503 to charge pretty much any of my devices)

Pros: Works with my Playstation portable, Nintendo DS lite, Gameboy Advance Micro, and a couple of other USB devices, namely ipods!

Cons: The advertised capacity is crap. it works good, though, and will fully recharge my PSP batteries a time or two - great for camping and no-power style trips.

Other: Get one if you run your batteries down a lot while not at home!