Here is a table with results of 9V Alkaline batteries that we have tested so far, click on a header row to sort the list by it, click on the battery name to see the detailed test for the particular model of battery that we did. By default the test results are sorted with the highest capacity in mAh first, going down to the lowest capacity in the end.

Battery 0.05A Load Test (mAh) 0.05A Load Test (Wh)
9V Q-Lite Alkaline Battery 466 mAh 3.540 Wh
9V Maxell Alkaline Battery 432 mAh 3.251 Wh
9V GP Ultra Alkaline Battery 319 mAh 2.373 Wh
9V Sony Ultra Super Carbon Zinc Battery 151 mAh 0.998 Wh
9V Duracell Alkaline Battery 311 mAh 2.300 Wh
9V Toshiba Heavy Duty Carbon Zinc Battery 4 mAh 0.030 Wh
9V Duracell Procell Alkaline Battery 245 mAh 1.812 Wh
9V Fujicell Alkaline Battery 398 mAh 2.954 Wh
9V Varta High Energy Alkaline Battery 258 mAh 1.895 Wh
9V Energizer Industrial Alkaline Battery 380 mAh 2.816 Wh
9V Energizer Alkaline Battery 456 mAh 3.418 Wh
9V IKEA Alkalisk Alkaline Battery 492 mAh 3.744 Wh

We are going to be updating the list with results in the future as we are able to test more batteries of the same type, so that it would be easier to compare and choose the ones with best capacity for your use case, or just to help you get a better understanding on what to expect from a specific battery.

The 1.2V AA 2500 mAh Panasonic Eneloop Pro NiMH batteries are one of the best rechargeable AA size batteries out there for more serious tasks including higher current loads and use in low temperatures. Normally in our tests of AA size NiMH batteries we test up to 2.0A discharge and that is already considered pretty high current load, but this time we are going higher for the Panasonic Eneloop Pro to see what you can get out of them at 1.0A, 2.0A, 3.0A, 4.0A and even 5.0A… and this is form a single battery, not from a pack of 4 for example. You can check our initial test of the 1.2V AA 2500 mAh Panasonic Eneloop Pro NiMH batteries where we tested at 0.2A, 0.5A, 1.0A and 2.0A – our usual settings. The graph below is for the higher discharge currents we tested at and you can also see the results in mAh and Wh after that…


It seems that 1.2V AA 2500 mAh Panasonic Eneloop Pro NiMH batteries manage to handle really well up to 4.0A constant current discharge, managing to provide a little over 1500 mAh capacity. Going for 5.0A however significantly reduces the usable capacity in a constant current discharge situation at ust a little over 112 mAh before reaching the 1V output voltage from the battery. Do note however that in a variable discharge load with peaks to 5.0A for example the situation should be much different, for example using these batteries in a flash for a digital camera. So if you need AA size rechargeable batteries that can really handle high discharge current loads, not only peaks, but constant ones, then you should definitely look for the

High Current Load of 1.2V AA 2500 mAh Panasonic Eneloop Pro NiMH batteries:

– 2388 mAh at 1.0A load
– 2322 mAh at 2.0A load
– 2064 mAh at 3.0A load
– 1527 mAh at 4.0A load
– 112 mAh at 5.0A load

– 2.870 Wh at 1.0A load
– 2.601 Wh at 2.0A load
– 2.224 Wh at 3.0A load
– 1.591 Wh at 4.0A load
– 0.116 Wh at 5.0A load

Here comes a big power bank with 20 Ah capacity in the form of the ADATA P20000D Power Bank, their largest capacity model which caught our attention precisely with its big capacity, though we are going to be testing other ADATA power banks as well with smaller capacity soon. The ADATA P20000D is pretty big and weights almost half kilogram, but this is the result of the high capacity battery cells inside. The power bank is available in multiple colors and the one we have tested was the black version, though apart from the color difference they are using the same plastic case (being advertised as extremely fire, shock, and impact resistant). It is matte color mostly, though around the edges there is a glossy part that looks nice when the power bank is new, but easily and quickly scratches, so we are not that big fans of that design. Another thing that we do not like that much is the presence of a small LED light being advertised as a flashlight… that power banks simply does not need it as it is a sort of useless, but hey, another key sell point for 2 extra cents. What we find very useful and like is the display that shows the remaining capacity in percentage, it has a backlight as well and also displays the active input and outputs.

20000 mAh ADATA P20000D Power Bank Specifications:
– Capacity: 20000mAh (Rechargeable Lithium-ion battery 72Wh)
– Colors: Black / White / Yellow / Gray / Blue / Dark Blue
– Dimensions (L x W x H): 163 x 80.6 x 23.3 mm / 6.4 x 3.1 x 0.9 in
– Weight: 450g / 15.8oz
– Input: DC 5V/2A (Micro USB)
– Output: DC 5V/2.1A max. (Type-A USB)
– Accessory: Micro USB Cable; User Manual
– Warranty: 1 year


The 20000 mAh ADATA P20000D Power Bank comes with high capacity and that high capacity needs faster charging, though here we have a 5V/2A input that can easily take over 10 hours for a full charge of the batteries inside the device. There are dual USB outputs available, meaning you can charge two devices at the same time, though the combined output is 5V/2.1A, so not dual device fast charging, but two at 1 Amp each or one with thee higher charge current. Looking at the test results we are seeing good and stable voltage discharge curves – 4.94V at 1.0A and 4.8V at 2.1A, though we kind of expected a bit more in terms of actual usable capacity from this 20 Ah power bank… the results we’ve got are pretty much the average you could expect from a decent power bank. The high capacity is nice to have, but the bulky size and big weight certainly do not make that particular power bank from ADATA the best choice to always carry around with you in your bag or backpack.

The performance of the 20000 mAh ADATA P20000D Power Bank in our tests:

– 13544 mAh at 1.0A load
– 12560 mAh at 2.1A load

– 66.94 Wh at 1.0A load
– 60.15 Wh at 2.1A load

top