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Ian, the main reason all powertank type supplies don't last is because they have Sealed Lead Acid batteries which are not suited to deep and repeated discharge.
As John suggests you will get better service life from deep cycle batteries which have a different chemical composition to allow for repetative deep discharge. The single most important factor in battery life is the time interval between discharging and subsequent recharge, all lead acid batteries should be charged immediately following discharge if possible any more than a few days and the battery starts to sulphate.
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