Building a battery charger for AAA Ni-MH batteries.

Thread Starter

douce52

Joined Jan 31, 2008
1
Hello.

I am new to the electronics hobby and I would like my firt project to be a battery charger for my AAA NI-Mh batteries which are rated at 1.2 V.

I have found many examples of circuits to build. However, they are all for Alkaline batteries. I know I have to limit the voltage and amps coming form the wall to the batteries and I have to be mindful of over heating.

My question is do I have do anything different because my batteries are 1.2V and not 1.5V and because they are Ni-MH and not Alkaline?

Thank you
 

Audioguru

Joined Dec 20, 2007
11,248
My RC airplane is powered by an 8.4V Ni-MH battery that has seven AAA cells. Its capacity is 900mAh.
I charge it at 180mA for 6 hours when its voltage reaches 10.4V and it is beginning to get warm.
 

hgmjr

Joined Jan 28, 2005
9,027
Here is one individual's solution for the design of a Ni-MH battery charger. I'm not sure why anyone would think that Ni-MH type batteries are not rechargeable.

hgmjr
 
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