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Old May 17, 2002, 06:14 PM
Master of disaster
Travis's Avatar
Northern Virginia
Joined May 2000
707 Posts
Charging NIMH batteries?

I have recently purchased some 600 NIMH packs.
What is the correct way to slow charge these batteries?
What is the correct way to fast charge these batteries?
I am using a Astro Flight 112D charger.

Any advice would be appreciated
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Old May 18, 2002, 11:23 AM
Registered User
Kings Park, New York, USA
Joined Sep 2001
813 Posts
NiMhs

If they are AAA cells, I have some Sanyo 720mA AAAs that if you peak below 500mAs they may not peak at all. so on the slow peak side of things, you will probably be 4 to 500mAs.

You should consider this a fast charge for those cells.

If you must do a very fast charge, i would limit it to 1C or 600mAs.

A slow charge would be 60mAs for 15 hours, or 50mAs for 18 hours.

You can kind of cheat, if you have a 110D or 112D, if you power up while holding the start button, the charger goes into test mode. This shuts off peak detector. now if you put your multi meter in series with battery pack, you should be able to dial in 60mAs. Also put the thing on a timer so it shuts off after 15 hours.

Ron Parigoris

BTW I am conservative on my NiMhs. You can probably push to 1.2C, but heat kills them.
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Old May 18, 2002, 11:56 AM
Master of disaster
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Northern Virginia
Joined May 2000
707 Posts
Thanks Ron
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Old May 18, 2002, 12:36 PM
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Arngeir Blakseth's Avatar
Molde, Norway
Joined Jan 2001
2,467 Posts
Travis

I have a Kyosho Mini-z car that's using 720Nimh's ( I know it's not a plane ) and I'm charging mine at 1,5 to 2 amps with my Orbit peak charger. I have made a duct with a small 12 v fan that I put on top of the batteries when charging, that way the temp is under control when charging, they are not warmer than 30 degrees Celsius. They have been in use for six months and have been charged about 70-80 times and are holding up just fine. Without fan cooling they will get to hot. Don't ask me how I know

Arngeir
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Old May 18, 2002, 04:30 PM
Will work for planes
omega blood's Avatar
Fullerton, California, United States
Joined Jan 2002
1,783 Posts
Arngeir how is that mini z, I saw them at hobbypeople. Is it the same one that comes in the egg type case. How long can you run on it on NImh. I might get one based on your recomendation.
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Old May 19, 2002, 01:33 AM
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Arngeir Blakseth's Avatar
Molde, Norway
Joined Jan 2001
2,467 Posts
omega blood

It's really a cool little car, mine is a Honda S2000. And no it does not come in an egg type case ,it's in a rather large box complete with pistolgrip transmitter. On the 720 Nimh's ( named Twicell) I get about 35-40 minutes runtime before they really start to fade. The motor is a FA-130, there's actually a hop-up motor available too Then it goes like hell for 20-25 minutes.
Here's a link you migth find interesting:
http://www2.towerhobbies.com/cgi-bin...I=LXZF70**&P=0

Arngeir
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