We have already tested both the 9V Duracell Alkaline batteries and the 9V Duracell Procell Alkaline batteries and we’ve seen interesting results, we’ve decided to do a direct comparison between the two since there is a common belief that the Duracell Copper Top Alkaline batteries are actually the same as the Duracell Procell Alkaline. If the two types of batteries are exactly the same they should be able to provide very similar useable capacity in our tests, however this is not the case as you will see in a moment. In order to make sure that we are properly comparing the two types of batteries we got them with matching expiration dates just to be sure that there should be no significant difference due to self discharge if they were produced in bigger time difference.


So far our comparisons between Duracell Copper Top and Duracell Procell batteries have shown slight advantage in favor of the Procells for the AA and AAA size, so this time we kind of expected to get similar results, but to our surprise we did not. In fact the standard Copper Top Duracell battery did provide better result and with over 20% higher useable capacity than the Procell this is a significant different. We did check the expiration dates to match and have repeated the test with another 9V Duracell Procell battery just to be sure there was nothing wrong, but we got pretty much the same lower capacity from the Procell. In the end we can say that we were really disappointed from the 9V Duracell Procell batteries, we expected to see more from them, especially considering the fact that around 300 mAh is what a decent 9V Alkaline battery should be able to provide in our test conditions.

Duracell – Copper Top – Procell
0.05A load – 311 mAh – 245 mAh

With these results there is no way to recommend the Procell over the standard Copper Top model when talking about 9V Alkaline batteries from Duracell, though that is not the case with AA and AAA size Duracell batteries where we’ve seen very good performance from both Copper Top and Procell Duracell batteries. In fact when talking about 9V Alkaline batteries we are not going to recommend you to go for a Duracell at all, regardless if Copper Top or Procell as we have already tested other brands that are capable of giving you close to 50% more capacity than what Duracell does… and at a price that can be lower than that of Duracell!


The 9V Duracell Procell Alkaline batteries we are testing here are from the Professional series of Duracell, a series that has lot of controversy surround it regarding if these are the same batteries or not as the standard Duracell Copper Top batteries. We’ve already tested AA and AAA size Copper Tops and Procells with the same expiration date and compared them to reveal that the Procell batteries do perform a bit better, so we are expecting to see something similar with the 9V Procell batteries by Duracell as well and we are of course going to compare them to the 9V copper Tops that we have already tested here. The expiration date of the battery tested here is 03-2017, something that is very important to note when doing battery comparisons as while Alkaline batteries do self discharge pretty slow over time as compared to NiMHs for example they still do.


In order to test the capacity of the 9V Duracell Procell Alkaline batteries we are using a constant current discharge rate of 0.05A (50 miliampers) and we have managed to get 245 mAh and that is quite Ok for a 9V Alkaline battery, though we must say we kind of expected to see better performance out of these Duracell batteries. So in order to be sure we have picked up a second Procell battery and it got us 242 mAh under the same conditions, a bit of a disappointment considering the fact that we have managed to get better results out of a 9V Duracell Copper Top battery.

The performance of the 9V Duracell Procell Alkaline batteries in our tests:

– 245 mAh at 0.05A load

– 1.812 Wh at 0.05A load

To download a datasheet with the manufacturer’s battery specifications…


The 9V Toshiba Heavy Duty batteries we are testing here are essentially lower capacity Zinc batteries, even though they are not labeled as such the Heavy Duty in the name points exactly to that along with the lack of Alkaline anywhere written on the battery. These batteries are often found in supermarkets for example and are relatively cheap, so you can often make a mistake of taking them if you need a 9V battery for some device. And while nowadays 9V batteries are not so commonly used, there are still a lot of devices that need them and it is a wise idea to spend your money on something better that will last longer. The particular battery we are testing here is with an expiration date of 01-2016 and according to Toshiba these batteries are suitable for slightly heavy duty to light duty applications such as flashlights, radio cassette recorders and clocks.


In order to test the capacity of the 9V Toshiba Heavy Duty batteries we are using a constant current discharge rate of 0.05A (50 miliampers) and we have managed to get just 4 mAh out of the Toshiba battery. No, that is not a mistake, it simply means that our test discharge current seems to be a bit higher for these batteries and they simply cannot handle it well. So much for recommending these over any other Zinc batteries as we usually should get about 100-150 mAh as useable capacity in our test scenario under these conditions. In fact we have managed to get more useable capacity out of a Carbon Zinc battery that has expired already than what this new Toshiba battery has managed to provide. At a lower loads the battery should probably handle better and be able to provide higher useable capacity, however that does not make it things any better – in short we are very disappointed from the result.

The performance of the 9V Toshiba Heavy Duty batteries in our tests:

– 4 mAh at 0.05A load

– 0.030 Wh at 0.05A load