Archive for the ‘NiCd/NiMH Batteries’ Category

8-4v-200-mah-uniross-nimh-battery

The 8.4V 200 mAh Uniross NiMH batteries we are testing here are traditional rechargeable NiMHs and though they are labeled as 9V, they are consist essentially of 7 NiMH cells of 1.2V each, so they are more like 8.4V and not the same as 9V alkaline, but some battery manufacturers prefer to label their 8.4V NiMH products as 9V for the the consumer to easily associate them as a rechargeable alternative to the 9V Alkaline batteries and Uniross is apparently one of those battery makers.


8-4v-200-mah-uniross-nimh-battery-capacity

In order to test the capacity of the 8.4V 200 mAh Uniross NiMH batteries we are using a constant current discharge rate of 0.05A (50 miliampers) and we have managed to get 217 mAh and that is a bit over the rating of these batteries, so it seems that Uniross has done a good job with these. The only drawback is that the capacity of the battery is a bit on the lower end of the capacity offered by 8.4V products and that along with the fact that this is not an LSD battery makes is a bit of a problem if you want to get longer operation time when using this battery in a low power device.

The performance of the 8.4V 200 mAh Uniross NiMH Batteries in our tests:

– 217 mAh at 0.05A load

– 1.887 Wh at 0.05A load

8-4v-280-mah-fujicell-nimh-battery

The 8.4V 280 mAh Fujicell NiMH batteries we are testing here are from the traditional type of rechargeable Nickel Metal Hydride batteries and they come with a pretty high capacity for their type of 280 mAh, so we would be interested to see if they can actually deliver it. Fujicell rates these batteries as being capable of being recharged up to 1000 times, so they should be able to serve you for pretty long time considering that this type of batteries is often used for low power applications.


8-4v-280-mah-fujicell-nimh-battery-capacity

In order to test the capacity of the 8.4V 280 mAh Fujicell NiMH batteries we are using a constant current discharge rate of 0.05A (50 miliampers) and we have managed to get 285 mAh capacity before hitting the 7V cutoff voltage and that is actually a bit over manufacturer’s rating for this battery that is 280 mAh. So we cans ay that with this battery Fujicell has done a good job and they manage to deliver what they have promised as capacity, now if only the battery was also a low self discharge type NiMH, but nevertheless a good product from Fujicell.

The performance of the 8.4V 280 mAh Fujicell NiMH Batteries in our tests:

– 285 mAh at 0.05A load

– 2.486 Wh at 0.05A load

1-2v-aaa-1000-mah-varta-power-accu-nimh-battery

The 1.2V AAA 1000 mAh Varta Power Accu NiMH batteries are of the highest capacity rechargeable AAA size NiMHs that Varta offers, though these are the last of the non-LSD models as the company has apparently decided to replace this model with a low self discharge version. So far we’ve seen very good results in terms of performance from Varta batteries (especially when used in low power applications), so here we also have high expectations.


1-2v-aaa-1000-mah-varta-power-accu-nimh-battery-capacity

Starting the test of the 1.2V AAA 1000 mAh Varta Power Accu NiMH batteries with a low constant current discharge rate of 0.1A and got us 1086 mAh as useable capacity and that is a great result making these batteries great for use in low power applications. In fact the 1086 mAh capacity is the highest capacity from a rechargeable AAA size battery that we’ve measured so far. By further increasing the levels of load we still get good levels of capacity, though the results here are not as good as the one with 0.1A and they are more moderate, but still showing that these Varta batteries can handle pretty good high power use as well.

The performance of the 1.2V AAA 1000 mAh Varta Power Accu NiMH batteries in our tests:

– 1086 mAh at 0.1A load
– 818 mAh at 0.2A load
– 757 mAh at 0.5A load
– 742 mAh at 1.0A load

– 1.345 Wh at 0.1A load
– 1.013 Wh at 0.2A load
– 0.890 Wh at 0.5A load
– 0.799 Wh at 1.0A load


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