Posts Tagged ‘nimh

1-2v-aa-1050-mah-gp-ekopower-nimh-battery

The 1.2V AA 1050 mAh GP EkoPower NiMH batteries we test here are the traditional NiMH type (not LSD ones) and are of quite low capacity for a rechargeable battery. The fact that these NiMH batteries are rated at only 1050 mAh makes it clear why that capacity is not written with large letters, but you need to take some time to actually find where it is written. These GP EkoPower batteries are rated at up to 1000 recharge cycles which is still a plus even though they will be offering significantly less capacity than a standard Alkaline battery per charge.


1-2v-aa-1050-mah-gp-ekopower-nimh-battery-capacity

We started the tests of the 1.2V AA 1050 mAh GP EkoPower NiMH batteries with a constant current discharge rate of 0.2A (200 miliampers) and they were able to provide us with just 991 mAh disappointing us a bit as they are supposed to provide 1050 mAh typical capacity. On the other hand the overall low capacity of these batteries may be the reason why the do not handle that well with 0.2A constant current load, it is possible that they will perform better in a low current drain situations. Also going up to 2A constant current load these batteries were clearly not capable of handling such high loads of about twice the battery capacity. So if you have these batteries you should stick to using them only in devices with low power requirements, what we can say is that we were not very satisfied with what we got from the 1.2V AA 1050 mAh GP EkoPower NiMH batteries.

The performance of the 1.2V AA 1050 mAh GP EkoPower NiMH Batteries in our tests:

– 991 mAh at 0.2A load
– 910 mAh at 0.5A load
– 747 mAh at 1.0A load
– 12 mAh at 2.0A load

– 1.205 Wh at 0.2A load
– 1.043 Wh at 0.5A load
– 0.798 Wh at 1.0A load
– 0.012 Wh at 2.0A load

standard-battery-types-alkaline-rechargeable

There are multiple battery sizes that are the most commonly used ones, these are the AAA, AA, C, D and 9V batteries that can be either primary (single use) as well as rechargeable. But these batteries also have many other names, some of which are used by different manufacturers and in some countries the other names may be more popular than the typical types mentioned above.

AAA Alkaline Battery – MN2400, LR03, E92, 4203/4003, K3A, AM4, 824, LR03, 24A, R03 (carbon–zinc), 24D (carbon–zinc)
AAA Rechargeable Battery – HR03 (NiMH), MIGNON, MINI-STILO, 4003, E92, K3A, R0, UM4, KR03 (NiCd), ZR03 (NiOOH)

The typical capacity of an AAA size alkaline battery is around 1000-1200 mAh, for Carbon-Zinc batteries the capacity is around 500 mAh and the rechargeable AAA batteries of the NiMH type usually offer abound 800-1000 mAh capacity.

AA Alkaline Battery – MN1500, LR6, E91, 4206/4006, KAA, AM3, 815, LR6, R6 (carbon–zinc), 15D (carbon–zinc)
AA Rechargeable Battery – HR6 (NiMH), MICRO, STILO, 4006, E91, KAA, R6, UM3, KR6 (NiCd), ZR6 (NiOOH)

The typical capacity of an AA size alkaline battery is around 1500-2500 mAh, for Carbon-Zinc batteries the capacity is around 500-800 mAh and the rechargeable AA batteries of the NiMH type usually offer abound 1600-2900 mAh capacity.

C Alkaline Battery – MN1400, LR14, E93, 4014, KC, AM2, 814, LR14, R14 (carbon–zinc), 14D (carbon–zinc)
C Rechargeable Battery – HR14 (NiMH), BABY, MEZZA-TORCIA, 4014, E93, KC, R14, UM2, KR14 (NiCd), ZR14 (NiOOH)

The typical capacity of a C size alkaline battery can be up to about 8000 mAh, for Carbon-Zinc batteries the capacity can be up to about 4000 mAh and the rechargeable C batteries of the NiMH type usually offer abound 4500-6000 mAh capacity. Alternatively there are also special plastic adapters that can be used together with an AA battery to make a C size cell, though the capacity would be lower in this case than what a C size battery would normally provide.

D Alkaline Battery – MN1300, LR20, E95, 4020, KD, AM1, 813, LR20, 13D (carbon-zinc), R20 (carbon-zinc)
D Rechargeable Battery – HR20 (NiMH), HR20, MONO, TORCIA, 4020, E95, KD, R20, UM1, KR20 (Ni-Cd), ZR20 (NiOOH)

The typical capacity of a D size alkaline battery can be up to about 12000 mAh, for Carbon-Zinc batteries the capacity can be up to about 8000 mAh and the rechargeable D batteries of the NiMH type usually offer abound 2000-12000 mAh capacity. Alternatively there are also special plastic adapters that can be used together with an AA battery to make a D size cell, though the capacity would be lower in this case than what a D size battery would normally provide.

9V Alkaline Battery – MN1604, 6LR61, 522, 4022, K9V, 6AM6, A1604, 6LR61, 1604D (carbon‑zinc), 6F22 (carbon-zinc), 1604LC (lithium)
9V Rechargeable Battery – HR9V (NiMH), HR9V, E-BLOCK, TRANSISTOR, 422, 4022, 6F22, K9V, 6HR61, 6KR61 (NiCd), 11604 (NiCd)

The 9V batteries essentially consists of multiple cells to bring up the voltage higher – 6x 1.5V cells for carbon-zinc; 3 cells for Lithium; 6, 7 or 8 cells for NiMH (7.2V, 8.4V or 9.6V) using 1.2V cells. Alkaline batteries can go up to about 500-600 mAh capacity, 400 mAh for the carbon‑zinc, up to about 1200 mAh for lithium (non-rechargeable), 200–300 mAh for NiMH and about 100 mAh for NiCd.

1-5v-aa-3200-mah-mex-cell-nimh-battery

The 1.2V AA 3200 mAh Mex Cell NiMH batteries are a clear example of a Chinese manufacturer labeling rechargeable NiMH batteries with higher capacity then they actually are. These batteries are supposed to be 3200 mAh, however they are being sold at a price of NiMHs with half that capacity, so this is supposed to raise some suspicion. So when you see batteries with very high capacity that are suspiciously cheap and from a brand that you’ve never head of, then you should be careful. Anyway, lets us see what is the actual capacity of these batteries and what current they can handle.


1-5v-aa-3200-mah-mex-cell-nimh-capacity

The maximum capacity we’ve got from the 1.2V AA 3200 mAh Mex Cell NiMH batteries at the minimum constant discharge rate of 0.2A we are using for testing NiMH batteries was 1486 mAh or more than twice less capacity than the batteries are supposed to provide. The only good thing here is that the batteries are handling pretty well with a current load of up to 1A, but going for 2 amps current draw and the voltage quickly drops below the 1V cutoff that we are using.

The performance of the 1.2V AA 3200 mAh Mex Cell NiMH Batteries in our tests:

– 1486 mAh at 0.2A load
– 1416 mAh at 0.5A load
– 1237 mAh at 1.0A load
– 145 mAh at 2.0A load

– 1.847 Wh at 0.2A load
– 1.700 Wh at 0.5A load
– 1.418 Wh at 1.0A load
– 0.148 Wh at 2.0A load

Definitely not worth buying these batteries as they are not delivering the promised capacity, not even half of it, they are actually something close to 1500 mAh and even though they are cheap, you will most likely get a better quality 1500-1600 mAh batteries for the same price. Be careful with unknown brands promising very high capacity battery at way too attractive price!


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