Posts Tagged ‘GP batteries


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…


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


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.


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


The 1.5V AA GP Super Alkaline batteries are the mid-range model that offers high capacity for alkaline batteries from GP, so we were quite interested to see how these compare to other high-end alkaline batteries. These batteries are supposed to offer up to 7 years shelf life and the ones we’ve tested were marked for use up to 01-2019. GP offers also an Ultra lineup of Alkaline batteries that are supposed to offer even higher capacity than the Super lineup that we are testing here, so we should also check these models as well in the future. Bit for now let us see how the 1.5V AA GP Super Alkaline batteries can perform. GP’s website does not have a lot of useful information about the actual capacity that the Super Alkaline batteries should offer, so we are off to test to see what we can expect to get from them.


Starting with the power profile test of the 1.5V AA GP Super Alkaline batteries we can see that they can handle pretty high loads before reaching the cutoff voltage of 1V that we are using for our tests. We’ve managed to reach up to 1.55A current draw before the batteries hit the cutoff voltage and values over 1 Amp are not that common to find with alkaline batteries, so these batteries from GP are handling pretty well actually up to this point. The open circuit voltage of the 1.5V AA GP Super Alkaline batteries we’ve tested with was 1.58V, though of course that value decreases when the battery is under load.


Moving on to the constant current draw tests we are performing and starting with a 0.1A load tests for the 1.5V AA GP Super Alkaline batteries we’ve managed to get 2231 mAh capacity which we consider to be quite good. Going for 0.2A constant current draw form the batteries the useful capacity you can expect is 1839 mAh and going even higher the useful capacity gets pretty much in half in our tests at 0.5A and 1.0A as compared to the previous rate. Nevertheless the 1.5V AA GP Super Alkaline batteries still manage to perform very well even under higher constant current draw rates, though as usual for such situations we would still recommend to go for rechargeable NiMH batteries instead as the better choice.

The performance of the 1.5V AA GP Super Alkaline Batteries in our tests:

– 2231 mAh at 0.1A load
– 1839 mAh at 0.2A load
– 991 mAh at 0.5A load
– 458 mAh at 1.0A load

– 2.765 Wh at 0.1A load
– 2.197 Wh at 0.2A load
– 1.122 Wh at 0.5A load
– 0.504 Wh at 1.0A load