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One of the battery's cells must be busted. You can't fully charge an 11.5 Ah battery with a 1 amp charger in 8 hours.

Impossible for one of the cells to be broken it lasts 10 hours of use at least. Maybe it has something to do with my power supply.
 
Rubbish, but an obvious joke.

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Impossible for one of the cells to be broken it lasts 10 hours of use at least. Maybe it has something to do with my power supply.

I suppose it's entirely possible that chargers from different batches behave differently, and exceed their quoted specs.
 
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