Cover 2600mAh Variable Voltage E-Cigarette Battery (2-Pack)

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Just ordered this for 30 Dollars works out 19.81 GBP so not bad for a 2 pack.

Others seem to like them [Only registered and activated users can see links. ]

and going for 18.99 for one on Ebay

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Will let you know how they fare once they arrive from Hong Kong.

Not sure how long that will be.