i have this same thishttp://www.dealextreme.com/details.dx/sku.14289is a realy 2500mha battery and work fine with nds and psp .... with custom cable it work great for tablet.output of this battery is 5v 500ma
They now make booster chargers for laptops - even energizer and duracell make them - which you could get. A pretty expensive alternative to pluggin in...
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