Battery Round-up

 

Brand and Nominal
Capacity (AA)


Measured Capacity


(mAh)

%RSD


Measured Capacity


(%)

End Voltage (V)

Rating

Eneloop  2000 2,105 1 105.3 1.30 *****
Imedion  2100 2,208 1 105.1 1.46 *****
Konnoc
 2500 2,430 2 97.2 1.45 ****½
Powerex  2500 2,330 4 93.4 1.42 ****½
Powerex

 2700

2,698 2 99.9 1.45 *****
Sanyo

 2500

2,498 1 99.9 1.44 *****
Sanyo

 2700

2,654

3 96.6 1.46 ****½
Varta

 2700

2,670

1 98.9 1.45 ****½

 

Brand and Nominal
Capacity (AAA)


Measured Capacity


(mAh)

%RSD


Measured Capacity


(%)

End Voltage (V)

Rating

3YD 750 719 3 95.9 1.46 ****½
Eneloop 800 800 1 100 1.49 *****
Konnoc
900 698 4 77.6 1.45 ***½
Moden

1000

789 4 78.9 1.45 ***½
Powerex

900

830 1 93.3 1.45 ****½
Powerex

 1000

960 1 96.0 1.47 *****
Sanyo

900

873

1 97.0 1.45 *****
Sanyo 1000 930 1 93.0 1.46 ****½
Varta 800 703 1 87.9 1.44 ****

 

Notes:

1) Batteries were tested using a La Crosse AlphaPower BC-900 in the ‘Refresh Mode’. For AA batteries, a discharge current of 500mA was set which results in a charge current of 1000mA. For AAA batteries, a discharge current of 250mA was set which results in a charge current of 500mA. Batteries were repeatedly discharged and charged until the capacity was stable. For a 2500mAh set of AA batteries one discharge/charge cycle takes about 7.5 hours (5 hours discharging and 2.5 hours charging). Room temperature was about 25 degrees centigrade.

2) Minimum discharge/charge currents settable with the BC-900 are 100mA/200mA. These settings result in optimum battery life due to low heat produced but are not practical for routine testing as one discharge/charge cycle takes about 38 hours for a set of 2500mAh batteries. The entire refresh cycle could take as long as a week. In addition, the more aggressive discharge/charge currents of 500mA/1000mA are closer to what the battery manufacturers are using to spec their batteries.

3) The BC-900 default charge current (Charge Mode) is 200mA. However, at that current it takes 12+ hours to charge a set of new 2500mAh batteries — just too slow for me. I recommend using 500mA for routine charging. At 500mA, charging takes about ~5 hours and generates minimal heat. Once the batteries are charged, the AlphaPower automatically applies a trickle charge current so you can leave a set in the charger ready for quick use.

4) Where are the other major brands? Most Sony, Energizer, and Kodak rechargeable NiMH batteries are re-labeled Sanyo batteries (Sanyo OEM). You can confirm this by looking for the small ‘HR’ stamped on the bottom of the battery.

All battery related posts are here.

Buy Powerex 2700 AA batteries at Amazon.com.Top Rated
Buy Powerex 1000 AAA batteries at Amazon.com. Top Rated
Buy Eneloop AA 4 Pack at Amazon.com..
Buy Eneloop AA 4 Pack at Amazon.co.uk.



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