Hi guys

What is the safe and easy way to charge a 8.4V NiMH battery for backup power supply. My device is power by 12V adapter normally. The NiMH battery is only used when the 12V is lost.

I don't expect to use the NiMH battery at all as we don't usually have power cut, but lets say we normally have power cut 1-2 each year.

Can I just use C/20 and leave it charge the battery 24/7?

The package says standard charge 16 hours at C/10.

Here is what I think it will work:


Here is the battery I want to use:

Thanks guys!!

 

Read battery university

C/20 sounds too high for 24/7 forever floating.

You might want two different charge rates, one for recharge, and another for maintenance.

 

At a sufficiently low charge rate, NiMH can remain totally cool and yet suffer from overcharge.

But it doesn't mention any recommended standby charge rate, does anyone have any other source?

 

Another trusted source: Powerstream