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After googling I discovered that "overall efficiency is measured by dividing the watt/hours used by the battery charger by the mileage achieved, giving a figure of watt/hours per mile." On this basis it's definitely better value to get the 10ah battery as a spare and using that with my 12 ah...

Thanks for the reply. I suppose I need to find out what they all weigh and how much distance I'd get from the 10 ah as compared to the 12ah.

Hi - I have a volt pulse with the standard 36v 12 ah battery and in very hilly conditions I'm managing to get about 38 - 40 miles from it. I would like to go further and I'm wondering whether to upgrade to the 36v 16 ah battery ( which costs £490) or whether to carry a spare - i.e buy another...