Posts Tagged ‘GP batteries

The company GP Batteries is a pretty old and popular name when talking about batteries, but they also started making power banks with the advent of this new product category and they already have a umber of products available. Here we are testing one of their smaller capacity models – the 5000 mAh GP Portable Power Bank (FP05M) that looks and feels nice in terms of design and functionality and specs wise seems promising. It has an aluminum body, a convenient LED indicator for remaining capacity and support for 2.0A charging input and 2.1A charging output.

5000 mAh GP Portable Power Bank (FP05M) Specifications:
– Battery Type: Li-Polymer battery 3.7V 5000mAh
– Input current: 2A
– Output current: 2.1A
– Number of outputs: 1
– Size: 120 x 66 x 13 mm
– Weight: 165 grams (approx.)
– Operation Temperature: 5C ~ 40C
– Recharging time: 5 hours (approx.)

With the 5000 mAh GP Portable Power Bank (FP05M) we have performed our usual 1.0A and 2.1A constant current load tests and you can see the results on the discharge graph above. It is interesting to note the interesting jagged pattern of the discharge cure for both currents we have tested with the electronics of the power bank apparently trying to keep the output voltage closer to the 5V, so the output Wattage would not drop more even though the mAh capacity might still seem higher as we have seen on some other products. We are seeing good results under 1.0A and especially good under 2.1A load for a 5000 mAh power bank, so good job for GP Batteries for this device.

The performance of the 5000 mAh GP Portable Power Bank in our tests:

– 3023 mAh at 1.0A load
– 2896 mAh at 2.1A load

– 15.05 Wh at 1.0A load
– 14.02 Wh at 2.1A load


The 1.2V AAA 1000 mAh GP NiMH batteries we test here are of the standard NiMH type and are rated at 1000 mAh typical capacity and 930 mAh minimum guaranteed. Our experience so far with GP batteries has shown that some models are performing great while others not so well, so it will be interesting to see to which group we can add these batteries. So time to start the testes…


As we usually do we have started the test of the 1.2V AAA 1000 mAh GP NiMH batteries with a low constant current discharge rate of 0.1A and the result we got was 1085 mAh and that is pretty impressive for a battery rated at 1000 mAh. Going further with a load of 0.2A and we managed to get 1005 mAh which is still over the typical rating of these batteries, and with even higher load we still manage to get good results, though not that impressive as at 0.5A we are are a below the minimum rating. Still we are seeing very good performance from the 1.2V AAA 1000 mAh GP NiMH batteries.

The performance of the 1.2V AAA 1000 mAh GP NiMH batteries in our tests:

– 1085 mAh at 0.1A load
– 1005 mAh at 0.2A load
– 876 mAh at 0.5A load
– 796 mAh at 1.0A load

– 1.325 Wh at 0.1A load
– 1.211 Wh at 0.2A load
– 1.029 Wh at 0.5A load
– 0.874 Wh at 1.0A load


The 1.2V AA 2700 mAh GP NiMH batteries are the largest capacity NiMHs offered by the company and we are expecting to see good results from them. With GP’s batteries we’ve seen quite interesting results in our tests, some models are a bit disappointing, others are surprisingly good, but since we’ve seen varying results with the highest capacity NiMH batteries from different brands we are hoping that GP did not make any compromise with their top model at least.


Starting the test of the 1.2V AA 2700 mAh GP NiMH batteries as we normally do with a low constant current discharge rate of 0.2A and the result was 2664 mAh as capacity which is great result for a battery rated at 2700 mAh (typical capacity), we can say that it is perfect. Furthermore increasing the constant current discharge rate at up to 2.0A the batteries continue to perform great offering great useable capacity levels. We can say for sure that the 1.2V AA 2700 mAh GP NiMH Rechargeable batteries are really good choice and are true to their ratings, unlike the not so well performing 2500 mAh model that we’ve tested some time ago that got us a bit disappointed.

The performance of the 1.2V AA 2700 mAh GP NiMH Batteries in our tests:

– 2664 mAh at 0.2A load
– 2527 mAh at 0.5A load
– 2404 mAh at 1.0A load
– 2223 mAh at 2.0A load

– 3.329 Wh at 0.2A load
– 3.082 Wh at 0.5A load
– 2.801 Wh at 1.0A load
– 2.436 Wh at 2.0A load