much capacity, but slight variations

A battery is therefore weaker than the other. This is slightly problematic in a series circuit. Since this is a rechargeable battery then always is empty as the first, there is a danger of Tiefentadung. However, I can in this capacity for declared 5000mAh not complain anyway :) therefore also 5 star.
Maybe I just caught an exception battery.
In any case, these batteries are very good, even for large currents in the range of up to 1000 mA, the voltage keeps relatively well! So I would buy this battery again, and highly recommend him.