Battery Powered Gba Rechargers?

[BaDToaD]

Since I got my supercard SD I've been giving the GBA SP a bit of a hammering and was wondering are those battery powered rechargers any use. They go for about 4 or 5 pounds inc P&P on ebay and run off 4 x AAAs.

Other options are a USB charger lead or another charger to leave at work.

I'm sure you blokes will know the best option.

 

[skysnapper]

This is a cool charger, never need a power source again!

http://shop.gameplay.co.uk/webstore/produc...,_ds_and_gba_sp

 

[Goity]

The Winding handles are cooltastic, anywhere sell those nowadays? I know craig used to sell them.

 

[Shikaku]

This is a cool charger at never need a power source again!

http://shop.gameplay.co.uk/webstore/produc...,_ds_and_gba_sp

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I don't think those work in GB =p