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Old 01-04-2005, 10:22 PM   #1
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Default AA nimh cells, the dos and donts

so i finally switched over to some radioshack 2000mah nimh cells for my mx-3s (damn thing goes through batteries like a lawnmower through grass) but im having some trouble getting them to charge right.

first let me say i DO NOT use the charge jack on the transmitter to charge them! ever! i have a little rig i made for my charger that i hook the whole battery tray right up to. using my integy 16x3v6 i discharge them at 2A and charge them at 1A, but the best voltage i can get out of them is about 10.8 volts, which stabilizes at around 10.5 after a few minutes in the radio. once the voltage settles, i can run for a couple days before a recharge, but the lower voltage affects the radios performance. another guy at the track uses the same cells (actually the 1800mah radioshack nimh) and gets about 11.6 on a fresh charge. what am i doing wrong?
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Old 01-04-2005, 10:41 PM   #2
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i have been using AA's rechargables for about two years now.
11.4 volts is good. most of the time i am at least 11 volts on a full charge. all it takes is one battery not charging all the way and it will affect the others. maybe try another brand. i charge my batteries each time i go to the track. i would charge your batteries more often if you are using the radio more than a few times a week. also try not discharging them and just charge when they are low.
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Old 01-04-2005, 10:51 PM   #3
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thats partially the problem. once my radio gets around 10 volts and below, the radio tends to glitch alot. a strong signal from the radio and i have no problems, but once the voltage gets low i start having problems with the already problematic flourescent lights at the track. the batt alarm doesnt go off until 9.1 volts, but i cant really run indoors below 10. i use my radio about 5 days out of the week.
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Old 01-05-2005, 01:44 AM   #4
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When I started using nimh AA's I was also getting low volts - around 10.5v max charging at 1 amp.

I lowered my charge rate to about 400milliamps and now they are peaking around 11.3 - 11.5 volts.

Try that and see what happens.
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Old 01-05-2005, 03:40 AM   #5
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I have a 300mah charger from Radio Shack to charge my Tx batterie pack. I have an M8 and I use the AA batteries. I have the 2300mah from Duracell. I leave it on the charger until it gets warm. I get close to 12v from the fresh pack and it'll settle down to about 11.5v.
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Old 01-05-2005, 09:33 AM   #6
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300mah it is then...
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Old 01-05-2005, 10:44 AM   #7
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Keep in mind that it takes about a day and a half for them to charge like this. You might be better off getting another tray and set of batteries and just keep switching them out while their charging.
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