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10-16-2010 01:55 AM  8 years agoPost 21
Neon Juripuri

rrVeteran

Peculiar Mo USA

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I took off work early today to go flying. I got home and my new batteries were in the mailbox. I had 10.9 volts out of the box. I flew about 6 flights and my TX showed 10.1. It's a good thing the new ones showed up, because my old ones might have lasted 3 flights,they were shot.
The only thing close to instructions is on the pack.
STOP CHARGE WHEN PACK WARMS UP It also says you can fast charge at 1.0 amps with temp. probe.
The only problem I see is spacing off your batteries(leaving them on the "wall wart" charger too long)
Time will tell.
Fred

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10-16-2010 02:22 AM  8 years agoPost 22
dkshema

rrMaster

Cedar Rapids, IA

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The wall wart charger is generally designed so that you can leave it plugged into your batteries forever and not damage them.

The rate of charge is low enough so that at the "end" of the charge cycle, any excess gas generated as part of the chemical reaction can be easily reabsorbed by the battery's innards.

If you charge continuously at too high a rate, the gas generation exceeds the ability of the guts to absorb the excess. In that case, pressure builds up inside the cell. NiMh and NiCad cells have "vents" that will open to equalize the pressure. Some have vents that reseal themselves automatically. But each time you charge to vent, a small portion of the electrolyte is vented. Repeat this procedure often enough, your battery runs out of juice to keep it alive.

-----
Dave

* Making the World Better -- One Helicopter at a time! *

Team Heliproz

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10-16-2010 03:48 AM  8 years agoPost 23
Neon Juripuri

rrVeteran

Peculiar Mo USA

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Thanks for all of your answers dkshema.
I mostly fly on weekends,so putting my TX on charge in the morning should keep me from leaving my TX on the charger for too long. (I realize you said it would probably be OK). But there have been times I forgot and left my TX on charge for several days,and my old batteries did get warm. It looks like My wall charger will charge these fairly comparable to my old ones,I see no problems ahead.
Thanks Fred

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10-16-2010 06:22 PM  8 years agoPost 24
Four Stroker

rrElite Veteran

Atlanta

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Eneloops get very hot at 1 A. They aren't going to last long. I charge mine at 300 mA and sometimes 500 mA. They get warm at 500.

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10-17-2010 12:52 PM  8 years agoPost 25
fastflyer20

rrKey Veteran

N. Tonawanda, NY

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If you charge with an auto detection charger and the charge rate is too low, the charger can not accurately detect the peak and will over/under charge. I found a web site where someone did testing connected to analyzers and determined that .7A was the best compromise between heat generation and peak detection.

I break in new batteries with a wall wart, go 1.4x capacity. This is a conditioning charge.
After that I have used .7A auto detection charge rate and it works great.

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10-17-2010 06:03 PM  8 years agoPost 26
Four Stroker

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Atlanta

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What Delta are you using at 0.7 A ? I assume we are talking about Eneloops. I'll try it.

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10-17-2010 10:43 PM  8 years agoPost 27
fastflyer20

rrKey Veteran

N. Tonawanda, NY

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I have always used the default of 5mv.

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10-18-2010 06:40 PM  8 years agoPost 28
Four Stroker

rrElite Veteran

Atlanta

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Well then as a test, I will cycle my Eneloops at 0.7 A and 5 mV tonight. I will report back ! I can report from previous experience that they get warm to the touch at 500 mA and hot as hell at 1 A.

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10-19-2010 04:14 PM  8 years agoPost 29
Four Stroker

rrElite Veteran

Atlanta

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Eneloop charging at 0.7A and delta of 5 mV works OK. Warm but not hot. Capacity is slightly reduced - only 1550 mAh instead of 1600.

The bottom line is if they get hot either reduce the charge rate of the delta until they don't.

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10-21-2010 02:58 AM  8 years agoPost 30
fastflyer20

rrKey Veteran

N. Tonawanda, NY

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Goon information, it worked for me and your test helps confirm the settings.

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