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Old Nov 24, 2009, 07:31 PM
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Question
Lipo Charger Charging to 12.7 volts

Should I be concerned. This charger's port used to charge to 12.65. Could it be my latest 3S lipos have less IR?
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Old Nov 24, 2009, 07:44 PM
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Hard to say as some chargers do not have the most accurate displays in the world. I would be concerned that if the charger's display is accurtae the LiPolys most likely will have a somewhat shorter life.

Charles
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Old Nov 24, 2009, 07:48 PM
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The charger is a Polycharge 4 without a display that has charged hundreds of batteries. Port #3 typically charged to 12.65 (3s lipos), but now 12.7 is more typical, particularly w/new lipos. I did note that by the time the lipo came off the balancer, voltage was 12.65. Also, I check voltage by plugging into my amp meter. Thanks.
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Last edited by Maturo; Nov 24, 2009 at 07:55 PM.
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Old Nov 25, 2009, 10:32 AM
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Strange ... usually the Polycharge 4 undercharges (4.1 to 4.15V/cell). A charger with an integrated balancer would be more likely to stop the charge if any cell goes above 4.2V.
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Old Nov 25, 2009, 10:50 AM
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Quote:
Originally Posted by marc1 View Post
Strange ... usually the Polycharge 4 undercharges (4.1 to 4.15V/cell). A charger with an integrated balancer would be more likely to stop the charge if any cell goes above 4.2V.
I had a Polycharge 4 that had 2 ports that persistently overcharged to ~12.65 volts as measured by a calibrated lab grade DMM. Wasn't comfortable with this so I took it back to my LHS and swapped it out. All was fine with its replacement but it has been sitting idle for over a year since purchasing my iChargers.

Mark
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Old Nov 25, 2009, 11:02 AM
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Once upon a time, we were told by cell manufacturers that maximum full charge was 4.235 volts per cell - 12.7 for a 3S.

Bill
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Old Nov 25, 2009, 11:54 AM
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I have always understood 4.2 volts per cell as being the 100% stste of charge point however some safety devices use 4.3 + / - 0.010 .

I seem to remember the old PQ overcharge safety devices using 4.325 per cell but I am not sure. The above 4.3 + / - 0.010 is on a specification sheet right in fron of me.

In the past some have charged LiPolys to 4.3 per cell on purpose to gain a little extra bost in competation. While fairly safe with balanced cells it tends to reduce their life.
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Old Nov 25, 2009, 12:02 PM
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Port #3 charges to an actual 12.63 measured by high end dvm, however my amp meter indicactes 12.70 and reads in .05 volt increments. I guess my polycharge is still working great and so convenient to have 4 chargers in 1 compact unit.
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Old Nov 25, 2009, 12:05 PM
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http://www.rcgroups.com/forums/showthread.php?t=528582

Also, see page 8, "Charging" in attached document.
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