about batteries...
 

I suppose this is the most appropriate place to ask about batteries...

I am talking about your standard home or discman-use batteries (A,AA, AAA etc.) Many of my AA batteries are in the need of being replaced. I have noticed that Nickel Metal-Hydryde (NiMH) are slowly replacing NiCD batteries. What is the difference between a NiMH and NiCD battery (besides the chemical element)? Do the NiMH suffer from the memory effect as well? Is there a higher ampere capacity? Besides, can anyone explain me why the standard rechargable batteries (AA, AAA) always come in 1.2V instead of 1.5V? :confused:

The voltage difference is because the chemical reaction for each type of cell is different, resulting in a different voltage. Each individual cell then gets connected in series &/or parallel to make up the required voltage & capacity however the physical size of the packaging imposes limits on just how many cells can be used.


NiMH do have a memory effect, but it's not as bad as NiCad, There are also limits to the number of recharges the different types have.