I was in the market for some AAA rechargeable batteries , must be like a decade since I purchased some so it was time . One of the packs I purchased was these Tenergy AAA rated at an astounding 1000mAh . Now I would have been pleasantly surprised if they had been able to achieve that . Now an interesting thing occurred with these Tenergy AAA batteries - They would not terminate charging . The first time when I was topping off the batteries for the first discharge the charger pumped in some 1400mAh . I thought this a little high . The second time I was busy and by the time I checked the charger some 1800mAh had gone into the Tenergy AAA batteries . ( Charge rates was 0.3A ) . The third time , by the time I checked some 2400mAh had gone into the batteries ( obviously converted into heat ) , and still only 96% charged according to the charger . The fourth time some 2800mAh went in and the charger was reporting 98% charged . Only the 5th time did the charger terminate charging at 1200mAh into the batteries . With this much energy consumed by the batteries for a charge I can say that the transfer of energy is very inefficient .
Actual discharge results : Discharged at 0.5A
1st Discharge …
470mAh , 518mAh , 563mAh , 563mAh
2nd discharge …
629 , 633 , 567, 589
3rd discharge …
676 , 723 , 677 , 729 ,
4th discharge …
725 , 721 , 676 , 683 ,
5th discharge …
662 , 713 , 703 , 650
So with a claimed capacity of 1000mAh , we are seeing a 65% to 70% return on the capacity claim at a discharge rate of 0.5A