We have picked up a pack of fresh 1.5V AAA Sony Alkaline Blue (AM4L-B4D) batteries to test and see how well will they perform. The batteries are produced in 01-2019 and Sony claims that these are longer lasting batteries that can keep power for up to 8 years (expiration date 01-2027) if properly stored at ambient temperature between 18 and 22 degrees Celsius. Of course most people do not care much for their batteries and will probably not try to extend their live, especially for cheaper alkaline batteries like these, so hardly they will be kept under optimal conditions. With alkaline batteries you usually pick a pack and put them right to some use in a device, so just make sure you get a freshly produced cells.


The 1.5V AAA Sony Alkaline Blue batteries do manage to show good results in our tests with capacity above average (closer to the top performers in the AAA alkaline category) and better than what we have got a couple of years ago from Sony Stamina Plus AAA batteries. We are getting high usable capacities for 0.1A, 0.2A and 0.3A constant current loads and going for the higher 0.5A discharge test we see a more significant drop in the usable capacity. The longer 8 year shelf life of the batteries is also a plus, compared to the regular 5 years that most alkaline batteries normally get.

The performance of the 1.5V AAA Sony Alkaline Blue batteries in our tests:

– 910 mAh at 0.1A load
– 784 mAh at 0.2A load
– 609 mAh at 0.3A load
– 324 mAh at 0.5A load

– 1.101 Wh at 0.1A load
– 0.926 Wh at 0.2A load
– 0.692 Wh at 0.3A load
– 0.362 Wh at 0.5A load

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

Time for another tests of 1.5V IKEA Alkalisk alkaline batteries, this time a pack of AA sized batteries with a fresh production date that we especially check when picking up the 10-battery pack from the store (after getting AAA IKEA alkaline batteries with old production date recently). The production date of these affordably priced batteries from IKEA is 07-12-2018 and the expiration date is 2023, so a 5 year warranty and pretty fresh batch of batteries at a good price in 10-pack box, but let us see what we can expect from them in terms of usable capacity in our tests…


The 1.5V AA IKEA Alkalisk Alkaline batteries are performing quite well in our tests all the way up to the 0.5A constant current load, after which the usable capacity shows a larger drop. The capacity levels are above average for these IEKA batteries, but are far from the top performers in our tests. Still the 1.5V AA IKEA Alkalisk alkaline batteries do manage to provide a very good price/performance ratio for everyday use without having some more specific requirements.

The performance of the 1.5V AA IKEA Alkalisk Alkaline batteries in our tests:

– 2127 mAh at 0.1A load
– 1845 mAh at 0.2A load
– 974 mAh at 0.5A load
– 310 mAh at 1.0A load

– 2.618 Wh at 0.1A load
– 2.230 Wh at 0.2A load
– 1.108 Wh at 0.5A load
– 0.344 Wh at 1.0A load

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