NiMH Capacity

[ColorMaker]

I am new to NiMH battery technology. I have purchased a few cells from varoious online companies and assembled cells in 6 and 12 volt packs. I am using Cadex C7400ER battery anylizer. I am finding cells that are marked are not aways testing at there capacities. How does industry test for capacity and how do manufacturers get away with this ?

I tested 10 AA for a 12 volt pack 2600 ma tested at 68% This was done using a total of 100 cells and all came in under or at 68%

I did the same for some D cells but assembled 6 volt pack. They all tested at 99% These were 9500ma cells.

JM

 

[Mr Happy]

There's lots of information about this in the historical threads. You will dig up loads of information from reading back through them and searching on various keywords.

In summary industry measures capacity with a standard test consisting of a timed charge at 0.1C for 16 hours followed by a measured discharge at 0.2C. However you may not always learn the actual result of this test from manufacturer specifications. The labels on cells are often somewhat optimistic.

If you charge and discharge at higher rates, you will measure lower capacities than obtained with the standard method above.

Another factor is that new cells often don't give full capacity until they have been through a few charge/discharge cycles, maybe five cycles or more.

 

[ColorMaker]

Thank you, I will read on

JM

 

[ColorMaker]

Thank you, I will read on

JM