i use these batteries,
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http://www.ebay.co.uk/itm/2x-ZOP-Mod...item5ae5745d34
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the above are 1800 mah and are £19 for 2
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or you could get the below ones that are 1500 mah, 2 batteries for £13.90
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http://www.ebay.co.uk/itm/2x-ZOP-Mod...item3f14833b6e