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Old 02-12-2013, 09:27 PM
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motomike
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Default RE: How to charge NiMH batteries

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Byron
I don't know just exactly what is different between the lengthy SANYO data sheet and red's clinic. The Sanyo sheet gives you directions on establishing a .1C charge rate at one point. Spog if you could specifically cite the differences you think are significant that would make digesting your opinions easier.

I think that if you follow Red's advice you will be happy with your batteries. You state you are charging your NiMh at 1.6C- that would be 2.56 amps. Since you had 1600mah batteries, I wondered if you were charging them at 1.6 amps or 1C. I think 1C is the max you want to charge them at and you need to be on your toes as you get near the end as Red cautions.

I charge new NiMh batteries at .1c a couple times and though my Dynamite charger has never missed a peak even at .1 I watch their heat as Red had suggested. After they have been in service for a few rotations I then charge them at .5 c and have never had the charger miss the peak. I check them before I go to the field with a loaded volt meter. I check them if I fly a lot while at the field. With 60 to 90 sized sport and scale planes (no 3d) with 5 to 8 standard servos the 2000 mah 6v packs have been good for many flights and plenty of reserve.

Since NiMh don't develop a memory you don't need to routinely discharge them.. But to make sure they still have adequate capacity, before the beginning of the season I use a 10ohm 10watt resister to discharge the packs to 1 volt per cell and then recharge them to see how much the charger had to put back in to get them to full charge. It should be somewhere near the stated capacity of the battery.

Good luck

Mike

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