Posts Tagged ‘carbon zinc battery

Time for another quick deja-vu with our second attempt to test the 9V Maxell Zinc battery as the last time we have tried over 5 years ago the battery we received was past its expiration date and although we tested it we did not include the results in our test for comparison with other batteries. This time around the battery we got was a fresher one with expiration date 08-2020, so close to a year and a half left, so not going to skit the results this time around.

We started with a deja-vu this post as the usable capacity of the 9V Maxell Zinc battery we got this time was almost the same as with the expired battery we have tested a while ago. At 95 mAh capacity in our 0.05A constant current discharge test the results are not great, but it is to be expected from a Carbon Zinc battery anyway. So apparently even at the end of its shelf life you can expect similar performance to the one at the middle and maybe not that much different even with freshly produced battery of this model… if properly stored of course.

The performance of the 9V Maxell Zinc batteries in our tests:

– 95 mAh at 0.05A load

– 0.690 Wh at 0.05A load

We are not big fans of Carbon Zinc single use batteries as a cheaper alternative to alkaline batteries, but from time to time we still pick up some cells to test and reaffirm that we do not like them. Carbon Zinc batteries are designed to be used on devices with smaller power consumption and they do not offer as much capacity as their alkaline counterparts, but they do come cheap and are widely available in various stores. We are giving the 9V GP Powercell Heavy Duty another chance as we have tried to test one of these a couple of years ago, but it has arrived with at the end of its shelf life. The one we received this time is slightly fresher with 10-2019 expiration date, so this time with half a year left of its shelf life we have decided to include it in our test results.

As expected the 9V GP Powercell Heavy Duty Carbon Zinc battery did not do much better than our previous try, it has managed to give out just 32 mAh capacity at our constant discharge test with 0.05A. The previous test of expiring 9V GP Powercell Heavy Duty battery with just one month left was a bit better with 38 mAh, but this can be a result of different storage conditions. Anyway, we warn you once again to be careful when buying Carbon Zinc batteries to always check the expiration date and always go for fresh ones (never buy these online if the expiration date is not stated!), or better yet – go for alkaline batteries instead.

The performance of the 9V GP Powercell Heavy Duty Carbon Zinc batteries in our tests:

– 32 mAh at 0.05A load

– 0.234 Wh at 0.05A load


The 1.5V AA Toshiba Super Heavy Duty batteries are of the Carbon Zinc type, however this is not mentioned anywhere on the battery itself and this along with the fact that the batteries are labeled as Super Heavy Duty gives out the fact that they are indeed Carbon Zinc. This simply means that the 1.5V AA Toshiba Super Heavy Duty batteries that we test here with an expiration date of 04-2016 are not going to provide as much capacity as an Alkaline battery. We are not very happy when we find a Carbon Zinc battery that is not clearly labeled as such as that may be misleading the buyer, especially if not careful enough. As a general rule of thumb Alkaline batteries should have Alkaline written on them as opposed to Carbon Zinc batteries do not have that clearly stated.


Anyway, lets us see what we can expect in terms of performance from these Carbon Zinc batteries from Toshiba. Starting our tests of the 1.5V AA Toshiba Super Heavy Duty batteries with a constant current discharge rate of 0.1A we’ve managed to get 874 mAh capacity and that is actually not bad for a Carbon Zinc battery. Doubling the constant current discharge rate to 0.2A and the batteries still manage to handle pretty well, however by further increasing the load to the 1.5V AA Toshiba Super Heavy Duty Carbon Zinc batteries they are starting to offer significantly less capacity. This is to be expected as Carbon Zinc batteries are intended for use in cases where low power is required.

The performance of the 1.5V AA Toshiba Super Heavy Duty Batteries in our tests:

– 874 mAh at 0.1A load
– 661 mAh at 0.2A load
– 298 mAh at 0.5A load
– 45 mAh at 1.0A load

– 1.065 Wh at 0.1A load
– 0.773 Wh at 0.2A load
– 0.317 Wh at 0.5A load
– 0.046 Wh at 1.0A load