Charging station complete

You can save those NiMh to other kids project but as said do not mix. Totally different ways of charging and usage :) But i would atleast test them :p


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The most obvious difference between Li-ion and NiMH batteries is the material used to store power. Lithium-ion batteries are made of carbon and highly reactive lithium, which can store a lot of energy. Nickel metal hydride batteries use hydrogen to store energy, with nickel and another metal (such as titanium) keeping a lid on the hydrogen ions.


Some minor info: http://auto.howstuffworks.com/lithium-ion-batteries-improve-hybrids1.htm
 
Oh don't worry I wasn't planning on mixing them with my others

I was surprised when I saw 4.5ah on the label and thought the best cell were the Panasonic cells from tesla cars so I did a quick search for these and found out the chemistry
 
I've only really ever seen NIMH cells at that high a capacity in a D cell form factor

Nimh in a pinch can be charged with just a resistor, but they are meant to use a smart charger, there biggest limitation is that its voltage actually drops by 4mV when its fully charged in CV mode. (you see a small current blip), but for the average person you have near no way of detecting this outside of an op amp integrator.

That and there discharge curve is almost perfectly flat, so its pretty hard to tell how charged you are.
 
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