The Eneloops are about eight years old and the Amazon Basics are a year old. All four were used, in series, in a flashlight. The Eneloops took 1050 mah each for full charge whereas the Basics took 1600 mah for full charge. Does this difference tell anything about the condition of the batteries? Are the Eneloops getting tired?
Charging AA Batteries
- Thread starter George7941
- Start date
Different capacities when new, sure. But they were discharged in series, so they should have all lost the exact same mah of charge. So why the diiferent mah to charge?
It's highly recommended to use matched sets of batteries the of same type and age in series.
The problem is that when one of the weaker ones runs out, the ones that are still charged will be pushing current backwards into the dead one, which is likely to cause damage.
The problem is that when one of the weaker ones runs out, the ones that are still charged will be pushing current backwards into the dead one, which is likely to cause damage.
Propflux01
$100 Site Donor 2026
More than likely they were different capacities. Not good to run them together.
Run the refresh/analyze on your charger to see if they’re still at their advertised capacity.
Internal resistance and chemistry differences of mismatched batteries will result in differing rates of discharge. Same with differing capacities resulting in the lower capacity battery dying first. As always best results come with a matched set.
In this case, none of the four batteries were fully discharged.
I refresh/analyze all the rechargeables once a year (in the dead of winter when I have more spare time)
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