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Old Feb 27, 2007, 06:59 PM
Rod
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Canada, BC, Kelowna
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Li-Po charging chart

A few days ago someone post a chart that showed the voltages of Li-Po batteries above which these cells should not be charged. Can someone point me to that chart?
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Old Feb 27, 2007, 10:47 PM
Fly it like you stole it..
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Florence, Al
Joined Oct 2000
29,301 Posts
You mean something like this:

1 Cell 4.2V (4.18-4.22)
2 Cell 8.4V (8.36-8.44)
3 Cell 12.6V (12.48-12.66)
4 Cell 16.8V (16.68-16.88)
5 Cell 21.0V (20.90-21.10)

Maybe that helps..

Jeff
www.CommonSenseRC.com
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Old Feb 28, 2007, 08:43 AM
Rod
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Canada, BC, Kelowna
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920 Posts
Thanks for your reply Jeff, however the chart I am looking for was a chart that indicatedthe voltage of LiPo cells that should not be toped off. That is if a cell (or multiples) is at X volts, do not put it on a charger to tpo off.
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Old Feb 28, 2007, 09:03 AM
Southern Pride
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Haralson County GA. USA
Joined Oct 2004
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LiPoly chargre to voltage / do not top off if above

Quote:
That is if a cell (or multiples) is at X volts, do not put it on a charger to tpo off.
That would depend on the charger and the user.
Astro Flight 109 and other chargers can jump to the wrong cell count (higher) if you charge a mostly fully(?) charged LiPoly battery.

There is no logical reason to charge(top off) a LiPoly if the cells are at or above approx. 4.15V ea.
Note: A LiPoly cell at 4.15 is considered 95% charged. Many charger result in a full(?) charge of 4.1 - 4.17 volts per cell. There some chargers which charge to 4.2 per cell at the termination point ,however if you chaeck the voltage 20 min. later it will most likely be in the 4.15-4.17 range.

If you battery provides a 10 min. (600 sec.) flight when charged to 4.2 the 4.15 (95%) will provide approx. 9.5 min. ( 570 seconds) of flight.
AF chart

http://www.rcgroups.com/forums/attac...hmentid=470206


Charles
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Last edited by everydayflyer; Feb 28, 2007 at 09:24 AM.
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Old Feb 28, 2007, 12:25 PM
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Joined Oct 2000
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Sounds like a chart of voltages that would prevent an autocount charger from making the wrong decision as to cell count. ie 4 cell @ 16V could be misread as a discharged 5s pack.

??
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