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Old Oct 08, 2012, 06:38 PM
Dude, I do fly all day long!
rcalldaylong's Avatar
San Jose, California
Joined Dec 2007
5,838 Posts
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nimh charging

I bought some eneloops and they are AA 1900mah

I am using the accucell-6 to charge them and I'm charging 2 of them in a series

After using them, they are both about 1.1v each before charging. I charge up and only managed to put back about 900mah.

I'm charging them in nimh mode with a rate of .1amp (lowest rate on charger)

Since I had 2 batteries in there, I would expect at least 1500-1800mah being put back or half of each of the battery.

Question is why so little? is it because 1.1v is only about 30% drained or so?

These are new Eneloops,...used about 5 cycles now.
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Old Oct 09, 2012, 03:22 AM
Registered User
Staffs, UK
Joined Nov 2003
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Since you have them in series the measured current is flowing through both so 900mAh means that 900mAh has gone into EACH battery.

Oh and resting voltage is a very poor indicator of how much charge is remaining in NiMH batteries. All you know is that at 1.1V there's less than there was at 1.3V .

Steve
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Old Oct 09, 2012, 03:26 AM
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Australia, VIC, Melbourne
Joined Feb 2010
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Quote:
Originally Posted by slipstick View Post
Oh and resting voltage is a very poor indicator of how much charge is remaining in NiMH batteries. All you know is that at 1.1V there's less than there was at 1.3V .

Steve
And 0V is flat

If you want to check capacity run them down slowly, put any significant load on a NiMH cell and you wont get close to the rated capacity (pretty sure thats a 1/20C discharge rating).
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Old Oct 09, 2012, 04:59 AM
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everydayflyer's Avatar
Haralson County GA. USA
Joined Oct 2004
34,817 Posts
One of my many Sanyo Eneloop test which I have posted here on RC Groups

http://www.rcgroups.com/forums/showp...&postcount=142

Discharged at 0.25 mA (1/4 A) for 7 hours , 1,750 mAh delivered down to 9.0V or 1.125 V per cell average as this was a 8 cell Transmittery battery.

Charged at 2A (1C) and discharged at 1A down to 7.2V (0.9V avg.per cell)

http://www.rcgroups.com/forums/showp...&postcount=141


1853 mAh delivered.

As I have posted numerious times many get less than stellar performance from Ni cells due to the simple fact they do not care from them properly , much the same case as with LiPolys.



Charles
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Last edited by everydayflyer; Oct 09, 2012 at 05:08 AM.
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