How long to charge 9v nimh battery

Dec 19, 2021 4 Replies

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AK 4 years ago

I have a 9V 180 ma discharged Nimh battery that I am charging at 25ma.

How long will it take to charge?

Thanks, Andy

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Phil Allison 4 years ago

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** What you have is a 180 mAh battery: h = hour. You do the math.

...... Phil

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Marco Moock 4 years ago

Am Sonntag, 19. Dezember 2021, um 05:57:15 Uhr schrieb AK:

Isn't it 180mAh? milliampere hours and not only milliampere?

(180mAh)/(25mA)=7,2h

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Robert Roland 4 years ago

For nickel based batteries, you normally add 40-50% to compansate for charging efficiency.

RoRo

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Phil Allison 4 years ago

Robert Roland wrote: ==============

** The OP posted a question from some test he had to do. So no such correction factor is needed.

For slow charge (8hr) rates - 40% might be OK. But absolutely not for fast charging, or the cells will cook.

..... Phil

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