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Battery test information

Results from battery testing. I use the four chargers available with a test function. This function displays the actual capacity of the cells under test. All of the chargers perform this test basically the same way. First the test parameters are set. Then the test cycle begins. The cells are charged to full using a -dV algorithm to detect full charge. Then the cells are discharged at the test rate while timing the discharge. When a predetermined voltage is reached (0.9V) then discharge is terminated. Then the cells are charged again. At the end of test cycle the capacity measured during the discharge is displayed. All cells are retail new and are run through a recondition cycle before capacity testing is performed. Using four different chargers tells a story about the chargers as well and gives more data points for each cell tested. This chart will grow as I get more batteries to test. Enjoy the results.

AA Cells


Battery Brand
and Type
 Test Results
Average
 Test Results
MH-C9000
 Test Results
BC-700
 Test Results
IQ328
 Test Results
BC-9009
PowerEx AA 2700
 2595 mAh 2420 mAh
 2690 mAh
 2610 mAh
 2660 mAh
AccuPower AA 2900
 2517 mAh 2359 mAh 2675 mAh 2522 mAh 2515 mAh
Eneloop XX AA (LSD) 2515 mAh 2420 mAh 2510 mAh 2520 mAh 2610 mAh
Tenergy Premium AA 2500
 2462 mAh 2367 mAh 2520 mAh 2457 mAh 2507 mAh
Ansman AA 2850
 2404 mAh
 2286 mAh 2515 mAh 2407 mAh 2410 mAh
Duracell AA 2550
 2397 mAh 2340 mAh
 2440 mAh
 2390 mAh
 2420 mAh
TruCELL Precharged AA (LSD)
 2330 mAh 2270 mAh 2400 mAh 2330 mAh 2320 mAh
PowerEx Imdeion AA 2400 (LSD) 2305 mAh 2210 mAh 2410 mAh 2290 mAh 2310 mAh
Delkin Devices AA 2900   *note 1
 2303 mAh 2192 mAh 2385 mAh 2330 mAh 2302 mAh
AccuPower AccuLoop AA 2300 (LSD)
 2282 mAh 2235 mAh 2342 mAh 2240 mAh 2312 mAh
La Crosse AA 2600 2217 mAh 2070 mAh 2460 mAh 2190 mAh 2150 mAh
Tenergy Centura AA 2000 (LSD)
 2076 mAh 2008 mAh 2122 mAh 2085 mAh 2090 mAh
Rayovac Platinum AA (LSD) 2052 mAh 2010 mAh 2090 mAh 2010 mAh 2100 mAh
Eneloop AA White (LSD) 2052 mAh 1940 mAh 2100 Ah 2060 mAh 2110 mAh
Tenergy (Blue) AA 2600
 2042 mAh 1990 mAh
 2140 mAh
 2000 mAh
 2040 mAh
BTY AA 3000
 529 mAh
 459 mAh
 575 mAh
 548 mAh
 537 mAh

AAA Cells


AccuPower AAA 1200
 1004 mAh
 1006 mAh
 1007 mAh
 1034 mAh
 971 mAh
PowerEx AAA 1000 999 mAh 981 mAh 1026 mAh 984 mAh 1004 mAh
Duracell AAA 1000 988 mAh 934 mAh 1017 mAh 973 mAh 1026 mAh
PowerEx Imedion AAA 950 (LSD) 966 mAh 907 mAh 1019 mAh 970 mAh 971 mAh
Tenergy Premium AAA 1000
887 mAh 854 mAh 900 mAh 890 mAh 906 mAh
Eneloop AAA White (LSD) 842 mAh 832 mAh 877 mAh 827 mAh 835 mAh
AccuPower AccuLoop AAA 950 (LSD)
 819 mAh
 817 mAh
 842 mAh
 807 mAh
 812 mAh
La Crosse AAA 1000 816 mAh 789 mAh 842 mAh 835 mAh 799 mAh
Tenergy Centura AAA 800 (LSD)
 792 mAh 774 mAh 838 mAh 774 mAh 782 mAh
Rayovac Platinum AAA (LSD) 797 mAh 773 mAh 788 mAh 806 mAh 820 mAh
Tenergy (Blue) AAA 1000 789 mAh 760 mAh 811 mAh 779 mAh 808 mAh


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(LSD) = Low Self Discharg type, ie. Imedion, Eneloop
Four cells are tested on each charger.
The average of the four tested cells for each charger is displayed.
Table is ranked by average of all tests for each brand and type.

*Note 1: The Delkin AA 2900 test anomaly. 3 pcs tested in the 2100 mAh range, one pc tested consistently above 2600 mAh on all test beds. I performed 10 recondition cycles on the 4 pcs, test results were consistent after reconditioning. It appears that if Delkin can get their manufacturing process reliable they could have the best battery tested. I attempted to contact Delkin about the problem and they refused to reply.

Test settings:
Maha MH-C9000.
Charge 1000 mA
Discharge 500 mA

La Crosse BC-700.
Charge 700 mA
Discharge 350 mA

AccuPower IQ328.
Charge 1000 mA
Discharge 500 mA

La Crosse BC-9009
Charge 1000 mA
Discharge 500 mA


C Cell


Battery Brand and Type
 500 mA rate
 1000 mA rate
AccuPower C 6000
 5173 mAh
 5125 mAh
Tenergy Premium C 5000
 5136 mAh 4127 mAh
PowerEx C 5000
 4373 mAh
 4156 mAh
PowerEx Imedion C 5000 (LSD)
 4051 mAh
 3939 mAh
AccuLoop C 4500 (LSD)
 4043 mAh 3887 mAh
Tenergy Centura C 4000 (LSD)
 3995 mAh 3848 mAh

D Cell


Battery Brand and Type
 500 mA rate
 1000 mA rate
AccuPower D 11500
 10290 mAh
 10020 mAh
Tenergy Premium D 10000
 8481 mAh 8469 mAh
Tenergy Centura D 8000 (LSD)
 8440 mAh 8282 mAh
PowerEx Imedion D 9500 (LSD)
 8338 mAh
 8187 mAh
AccuLoop D 10000 (LSD)
 8324 mAh
 8338 mAh
All C and D cells tested with modified MH-C9000.



Internal resistance measurement.

Batteries can be modeled as a voltage source in series with a resistance. In practical terms internal resistance gives an indication of how well a bettery can supply current to a load without the cell voltage dropping. Low internal resistance and low cell voltage drop. High internal resistance and high cell voltage drop. So if you are looking for a battery that can delivery high current to the load you want a battery with low internal resistance. In this test internal resistance is measured using the DC method. A programmable current source is used as the load so that load current can be precisely controlled. Cell voltage is measured by a high accuracy bench DVM. The results give a change in cell voltage for each current load. This data is plugged into ohms law to calculate the equivalent resistance. Internal resistance in the chart below is given in mili-ohms, that is thousandths of an ohm. Lower is better.

AA Cells


Battery Brand
and Type
 Internal Resistance Average
 Test Current 500mA
 Test Current 1000mA
 Test Current 2000mA
Duracell AA 2550 46 mΩ 46 mΩ 45 mΩ 48 mΩ
Eneloop XX AA (LSD) 47 mΩ
50 mΩ 44 mΩ 48 mΩ
Eneloop AA White (LSD) 50 mΩ 52 mΩ 48 mΩ 49 mΩ
PowerEx AA 2700 55 mΩ 68 mΩ 49 mΩ 48 mΩ
AccuPower AccuLoop AA 2300 (LSD) 56 mΩ 64 mΩ 52 mΩ 53 mΩ
Tenergy Centura AA 2000 (LSD)
 60 mΩ 66 mΩ 56 mΩ 58 mΩ
PowerEx Imdeion AA 2400 (LSD) 62 mΩ 50 mΩ 69 mΩ 66 mΩ
Tenergy Premium AA 2500
 62 mΩ 68 mΩ 60 mΩ 57 mΩ
Tenergy (Blue) AA 2600 66 mΩ 56 mΩ 73 mΩ 69 mΩ
truCELL Precharged AA (LSD) 68 mΩ 78 mΩ 65 mΩ 61 mΩ
AccuPower AA 2900 71 mΩ 72 mΩ 69 mΩ 71 mΩ
La Crosse AA 2600 74 mΩ 90 mΩ 68 mΩ 63 mΩ
Rayovac Platinum AA (LSD) 86 mΩ 82 mΩ 87 mΩ 90 mΩ
Delkin Devices AA 2900
 97 mΩ 98 mΩ 94 mΩ 100 mΩ
Ansman AA 2850
 105 mΩ 98 mΩ 111 mΩ 106 mΩ
BTY AA 3000
 119 mΩ 140 mΩ 114 mΩ 105 mΩ


AAA Cells


AccuPower AAA 1200 71 mΩ 72 mΩ 69 mΩ 71 mΩ
Duracell AAA 1000 84 mΩ 80 mΩ 87 mΩ 84 mΩ
PowerEx AAA 1000 86 mΩ 80 mΩ 98 mΩ 81 mΩ
Tenergy Premium AAA 1000
 86 mΩ 88 mΩ 87 mΩ 84 mΩ
PowerEx Imedion AAA 950 (LSD) 96 mΩ 108 mΩ 87 mΩ 92 mΩ
Eneloop AAA White (LSD) 96 mΩ 98 mΩ 101 mΩ 90 mΩ
Tenergy (Blue) AAA 1000 104 mΩ 104 mΩ 115 mΩ 92 mΩ
AccuPower AccuLoop AAA 950 (LSD)113 mΩ106 mΩ126 mΩ106 mΩ
Tenergy Centura AAA 1000 (LSD)
 113 mΩ 122 mΩ 113 mΩ 103 mΩ
La Crosse AAA 1000 141 mΩ 152 mΩ 140 mΩ 131 mΩ
Rayovac Platinum AAA (LSD)





C Cells


Battery Brand and Type
 Average
 500 mA
 1000 mA
 2000 mA
 3000 mA
Tenergy Premium C 5000
 18 mΩ 18 mΩ 18 mΩ 18 mΩ 19 mΩ
Tenergy Centura C 4000 (LSD)
 24 mΩ 34 mΩ 13 mΩ 24 mΩ 24 mΩ
AccuLoop C 4500 (LSD)
 25 mΩ 24 mΩ 26 mΩ 26 mΩ 23 mΩ
AccuPower C AP6000
 27 mΩ 32 mΩ 28 mΩ 25 mΩ 24 mΩ
PowerEx C 5000
 28 mΩ 20 mΩ 42 mΩ 27 mΩ 26 mΩ
PowerEx Imedion C 5000 (LSD)
 55 mΩ 80 mΩ 40 mΩ 42 mΩ 60 mΩ


D Cells

Tenergy Centura D 8000 (LSD)
 15 mΩ 12 mΩ 14 mΩ 15 mΩ 17 mΩ
AccuLoop D 10000 (LSD)
 17 mΩ 20 mΩ 15 mΩ 16 mΩ 16 mΩ
Temergy Premium D 10000
 19 mΩ 30 mΩ 15 mΩ 16 mΩ 15 mΩ
AccuPower D AP11500
 20 mΩ 28 mΩ 14 mΩ 22 mΩ 16 mΩ
PowerEx Imedion D 9500 (LSD)
 33 mΩ 44 mΩ 28 mΩ 25 mΩ 37 mΩ


So what does it mean??
Example: If the internal resistance is 50 mΩ and you need to drive a load of 1 A and assume a no load cell voltage of 1.25V then under that load cell voltage would drop to 1.20V.
If you need to drive a 2A load then the cell voltage would drop to 1.15V.
If the internal resistance is 100 mΩ at 1A load then cell voltage would drop to 1.15V. Under 2A load it would drop to 1.05V.

Of course the C and D cells performed the best.
All of the AA batteries seem to range form fair to good in terms of internal resistance.
The AAA batteries did not test as well but of course they have far less electrode surface area. However most put up a respectable performance.