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The 1.5V AA Duracell Alkaline batteries we are testing are the typical Duracell Copper Top batteries that you can find pretty much everywhere in a shop or a gas station. The Power Profile test checks how the battery handles different current loads before it reaches the cutoff voltage, the test starts at 0A and gradually increases with steps of 0.05A each 20 seconds until it the cutoff voltage of the cell is reached. Only the battery that we’ve tested with constant current discharge using 1A load got slightly hotter than the ambient temperature of 25 degrees Celsius that we are testing at. No, all of the tests are with constant discharge rate – the load is the same from the start to the end of the test (reaching the cutoff voltage). The 1.5V AA Philips PowerLife Alkaline batteries are the first batteries from the company that we are testing, so we were quite interested to get a look at how they perform compared to others as Philips is a well known name in the consumer market. The 1.5V AA Varta High Energy Alkaline batteries are a slightly improved version of the Varta Simply Alkaline batteries and according the the manufacturer these should be able to provide 23% more power than the normal Varta Alkaline batteries. Definitely not worth buying these batteries as they are not delivering the promised capacity, not even half of it, they are actually something close to 1500 mAh and even though they are cheap, you will most likely get a better quality 1500-1600 mAh batteries for the same price. So far we have been testing and reporting the Amp-Hours (Ah) of the various batteries we have tested with the reason being that they are usually being rated in Ah regarding their capacity. With each battery we usually have two important ratings, though both are usually revealed by the manufacturer only for rechargeable batteries – Voltage and Amp-Hours (usually written in mAh). To get an estimate about the Watt-Hours rating of a battery you need to multiply the Amp-Hours by the Volt rating of the battery. Another thing that we are going to be adding soon are tables that will make it easier for you to compare the performance of all of the batteries that we have tested, of course the tabled results will be divided by battery type.
The 1.5V AA Fujicell Alkaline batteries we test here are the standard and only Alkaline batteries that the company makes. The batteries we’ve got for testing are under warranty until 03-2019 and Duracell mentions that these are guaranteed for 10 years in storage. The batteries we’ve got for testing are under warranty until 03-2019 and Duracell mentions shelf life of about 7 years for these batteries. These numbers however are not for constant current discharge, but instead for a duty cycle use that includes a few hours a day and we are testing with constant current discharge, so we expected to get a bit lower numbers in our tests. At the end of the discharge cycle the temperature of that battery has reached 31 degrees C. Of course there is more charge left in the battery when discharging with higher constant current after it reaches the cutoff and left to rest for a bit you can get more out of it, especially if the load is lower.

Increasing the constant current load to the higher values we use for testing the batteries continued to show very good performance and even in high loads they’ve managed to offer good performance. The batteries were with an expiration date of 04-2016 and the manufacturer’s quoted shelf life for these batteries is 5 years, meaning that they were produced in 2011, so the capacity we get could be slightly lower than that of fresher batteries that were produced at a later date. The batteries we have tested here have an expiration date of 06-2016, so they should be with a 5 year shelf life as they appear to have been produced in 07-2011. These batteries are supposed to be 3200 mAh, however they are being sold at a price of NiMHs with half that capacity, so this is supposed to raise some suspicion.
The only good thing here is that the batteries are handling pretty well with a current load of up to 1A, but going for 2 amps current draw and the voltage quickly drops below the 1V cutoff that we are using. Be careful with unknown brands promising very high capacity battery at way too attractive price! The 1.5V AA Maxell Super Alkaline batteries we used for testing were with an expiration date of 01-2018, so they are supposedly offering quite a long shelf life. Increasing the constant current load further and these Alkaline batteries from Maxell still manage to perform quite well, so we can say that they are providing above the average capacity and this only rises our expectation from Maxell’s Super Alkaline batteries that are supposed to offer even better results. But there is another unit that may actually give a better idea about the capacity of a battery and it is Watt-hours (Wh) when talking about batteries. Different batteries may have different voltages and capacities and normally you should do some math to know what you can expect from a battery if you know the power requirements of the device you need the battery for. So far the results we’ve seen from Fujicell batteries are very good in terms of available capacity for the price these batteries are being sold at. Going for higher load we are still getting pretty good performance in terms of useable capacity out of these batteries. 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.
The Duracell batteries are able to handle quite well higher current drain for a while and although there is an expected drop in the useable capacity you get even at 1A constant current load we got a decent performance out of them.
What Duracell mentions about these batteries is that they can operate in temperature extremes between -20°C and +54°C, and that the Procell batteries are ideal for applications such as torches, telemeters and measuring instruments, microphones and medical devices. What was interesting here is that the Duracell Procell batteries are able to handle quite well higher current drain for a while and although there is an expected drop in the useable capacity you get even at 1A constant current load we got quite good performance out of them and this is something that is not very common for Alkaline batteries.
We were quite pleasantly surprised by the good capacity and the ability of these Alkaline batteries to handle higher loads with ease and this makes them interesting not only for low drain applications that typically Alkaline batteries are used for, but also for applications where higher current load may be required as they are apparently able to handle well in such situations.

So it will be interesting to see how good other AAA size Alkaline batteries will compare in terms of capacity in our tests. Apparently these Philips Alkaline batteries are intended mostly for applications not requiring too much power, and though they manage to provide some capacity in applications requiring more power, this is definitely not their strength. Varta does not provide detailed specifications about these batteries, but the company recommend their use for power-hungry devices, e.g. So when you see batteries with very high capacity that are suspiciously cheap and from a brand that you’ve never head of, then you should be careful. Maxell recommends the use of their Super Alkaline batteries for devices including portable radios, flashlights, radio control vehicles, MP3 players and portable GPS systems. But this is just an estimate, because as we’ve already said the voltage of the battery will vary while it is being discharged, so we need to do a thorough test measuring the full discharge cycle to get more accurate value.
Not the highest possible capacity and usually a bit lower than the NiHM rating, though they are probably stating the typical and no minimal capacity is mentioned anywhere, but these batteries are available at a better price than most other similar products. Hopefully the even higher capacity GP NiMH batteries will be able to provide better results than what we’ve got from these. The funny fact is that I got a dozen cheap supermarket batteries and they got pretty much the same performance as the ProCell. Anyway, lets us see what is the actual capacity of these batteries and what current they can handle.
If you look at the discharge graph and the Amp-Hours in our battery tests with different loads you will see how the voltage is different at different load levels and this will also affect the Watt-Hour ratings as well. 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. So by switching from the Ah to Wh we can take into account the changing voltage of the battery while it is being discharged and get even better idea about its actual energy capacity, even though the Amp-Hours ratings usually do a good job for comparing batteries. The biggest problem with this kind of setup is the resistance of the cables, connections, multimeter shunt voltage drop and so on.

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