Although I did not measure initial capacities, these voltage measurements strongly indicate that the Activ Energy cells are low self-discharge cells. This was not far below freshly charged 1.42 V and well above nominal 1.20 V. Self dischargeĪctiv Energy cell voltages initially were 1.29 V at 12 months after manufacture. Discharge test 3 had the highest voltage. The Activ Energy cells had flat discharge curves and mid-discharge voltage was close to nominal 1.20 V for NiMH cells.ĭischarge curves for Active Energy Cell 4. Altogether, these tests show 200 to 500 mA less than rated capacity. Other tests of Activ Energy cells have reported mean capacities of 2045 mAh after a few break-in cycles (previous generation, 2300 mAh cells) and 2220 mA. One Sanyo Eneloop and one Panasonic Eneloop were tested one time.Īverage discharge capacity for Activ Energy cells was similar to Eneloops. Four Active Energy cells were discharged three times. The Activ Energy cells were tested in the following sequence:įor comparison, I also tested one new Panasonic Eneloop and one well-used Sanyo Eneloop:ĭischarge capacities. I charged the cells with an Olympus Ni-MH Battery Charger BU-100 (around 2002 or 2003 vintage) at 490 mA per cell. Estimates of capacity are imprecise because of low sampling frequency and variable end-points. I stopped the discharge when voltage decreased below 0.9 V under load. Discharge current was about 400 mA and discharge duration was about 5 hours. I discharged the cells using a 2.4 ohm resistor and recorded voltage and current at regular intervals. It was not explained what product features were tested. The Activ Energy packaging included an LGA tested quality mark. I assume 85% capacity retention in one year, like the Eneloop Pros and 2nd generation Eneloops. Self-discharge performance was not specified for the Activ Energy AA cells. I assume maximum cycles is about 500, like Chinese Eneloops Maximum cycles was not specified for the Activ Energy AA cells. The capacity of the Activ Energy cells appears over rated in this comparison. The mass of the Activ Energy AA cell is about the same as for 1900 mAh Eneloops and lower than 2450 mAh Eneloop Pros. The Panasonic Eneloop Pro dimensions and mass are from lygte-info.dk The standard eneloops I own and measured. Here is a comparison with Eneloop specifications: CellĪctiv Energy AA cells compared to Eneloops.

The Activ Energy AA cells tested were 2400 mAh capacity, low self-discharge and “extra long life”.

Activ energy battery charger