Just checking: did you try ‘kicking’ the battery’s software? There’s instructions (as well as other useful information) on the wikipost: A little Guide to … Fairphone’s Battery (FP1 / FP1U). It seems that in some cases this helps, whilst in other cases (e.g. post 163) it turned out to be an early sign of a failing battery.
The battery problems don’t seem to be a universal problem - my battery life actually increased after updating from 1.6 to 1.8.5.
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