Posts Tagged ‘GP’

1.2V AA 2500 mAh GP Rechargeable NiMH Battery Tests

6, Sep 2013

1-2v-aa-2500-mah-gp-rechargeable-nimh-battery

The 1.2V AA 2500 mAh GP Rechargeable NiMH batteries are supposedly from the higher capacity rechargeable models from GP and we had high expectations when we started testing them. They are rated at 2500 mAh typical and 2450 mAh minimal capacity, though our test results show a bit different picture and in order to avoid a possible mistake we even repeated the tests 3 times and got pretty much the same results. So take a look below to see what you can expect from these NiMH batteries from GP. We’ve already seen that different GP models can provide different results and apparently not all models are as good as you could expect them to be.


1-2v-aa-2500-mah-gp-rechargeable-nimh-battery-capacity

We have started the test of the 1.2V AA 2500 mAh GP Rechargeable NiMH batteries as we normally do with a low constant current discharge rate of 0.2A and the result we got was 2223 mAh as capacity and that is a bit of a disappointment. With more than 12% less than the advertised capacity and with repeating the tests multiple times just to be sure we are a bit disappointed, though the batteries did manage well at 0.5A and 1.0A, the results at high load with 2.0A were also disappointing. Hopefully the even higher capacity GP NiMH batteries will be able to provide better results than what we’ve got from these.

The performance of the 1.2V AA 2500 mAh GP Rechargeable NiMH Batteries in our tests:

– 2223 mAh at 0.2A load
– 2037 mAh at 0.5A load
– 1808 mAh at 1.0A load
– 66 mAh at 2.0A load

– 2.769 Wh at 0.2A load
– 2.388 Wh at 0.5A load
– 1.987 Wh at 1.0A load
– 0.068 Wh at 2.0A load

1.2V AA 1800 mAh GP Rechargeable NiMH Battery Tests

25, Aug 2013

1-2v-aa-1800-mah-gp-rechargeable-nimh-battery

The 1.2V AA 1800 mAh GP Rechargeable NiMH batteries are a middle range rechargeable batteries from GP with a typical capacity of 1800 mAh and a minimum one of 1750 mAh. These are sub 2000 mAh rechargeable batteries they will probably have a hard time at our 2A constant current load test, but they should handle well at lower rates. Since we just tested the slightly lower capacity 1600 mAh model from GP we are quite interested to see how these compare to them, especially since the 1600 mAh model was able to provide a bit over 1800 mAh capacity at 0.2A constant current load.


1-2v-aa-1800-mah-gp-rechargeable-nimh-battery-capacity

We have started the test of the 1.2V AA 1800 mAh GP Rechargeable NiMH batteries with a constant current discharge rate of 0.2A here we’ve managed to get 1829 mAh or a slightly more than the typical rated capacity. This value is just 9 mAh more than what the 1600 mAh model from GP managed to offer at this test, however moving to higher loads the 1800 mAh NiMHs do manage to outperform the 1600 mAh model. So while for lower loads the 1.2V AA 1600 mAh GP Rechargeable NiMH batteries might perform roughly the same, moving to higher loads this 1800 mAh version will be the better choice as they are able to even provide some useable capacity at 2A constant current load.

The performance of the 1.2V AA 1800 mAh GP Rechargeable NiMH Batteries in our tests:

– 1828 mAh at 0.2A load
– 1729 mAh at 0.5A load
– 1270 mAh at 1.0A load
– 103 mAh at 2.0A load

– 2.219 Wh at 0.2A load
– 2.018 Wh at 0.5A load
– 1.352 Wh at 1.0A load
– 0.106 Wh at 2.0A load

1.2V AA 1600 mAh GP Rechargeable NiMH Battery Tests

25, Aug 2013

1-2v-aa-1600-mah-gp-rechargeable-nimh-battery

The 1.2V AA 1600 mAh GP Rechargeable NiMH batteries are a middle range rechargeable batteries from GP with a typical capacity of 1600 mAh and a minimum one of 1550 mAh. At first glance there is nothing special about these batteries, they are not offering very high capacity and since they are sub 2000 mAh they will probably have a hard time at our 2A constant current load test. But anyway lets us see how good will these batteries perform in our tests and what we should expect from them…


1-2v-aa-1600-mah-gp-rechargeable-nimh-battery-capacity

We have started the test of the 1.2V AA 1600 mAh GP Rechargeable NiMH batteries with a constant current discharge rate of 0.2A here we’ve managed to get 1819 mAh capacity and that kind of surprised us as these batteries are rated as 1600 mAh typical capacity. Furthermore getting a bit over 1800 mAh from a 1600 mAh NiMH battery at a 0.2A constant current load is nothing short of great performance, going to 0.5A constant current load we got 1614 mAh and that is also a bit over the typical capacity that these batteries are rated for, so another great result. At 1.0A constant current load these batteries still managed to provide over half of their rated capacity though we should note that the voltage they provided during most of their discharge cycle was very close to 1V, so this can cause some problems like premature invoking of low battery cutoff. And going for 2.0A constant current load as expected is a it too much for the 1.2V AA 1600 mAh GP Rechargeable NiMH batteries, in fact our power profile test show that they can handle up to about 1.7A load. Nevertheless these NiMH batteries from GP Batteries are performing very good and could be rated more like as 1800 mAh and not as 1600 mAh as our tests have shown.

The performance of the 1.2V AA 1600 mAh GP Rechargeable NiMH Batteries in our tests:

– 1819 mAh at 0.2A load
– 1614 mAh at 0.5A load
– 815 mAh at 1.0A load
– 0 mAh at 2.0A load

– 2.205 Wh at 0.2A load
– 1.836 Wh at 0.5A load
– 0.823 Wh at 1.0A load
– 0 Wh at 2.0A load


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