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Old Apr 12, 2011, 08:52 AM
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Joined Jul 2008
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Parallel Charging Boards

I'm new to this Lipo thing and have started with 2 sets of 3 Lipo packs that have a P designation, as in: 1300mAh 2S1P 20C 7.4v and 1800mAh 3S1P 20C 11.1v.

My understanding is that within a pack with this designation 2 or more of the cells are connected in parallel.

Is this a pack that should NOT be charged on a parallel charging board; or, is it no different, other than the same cautions?

Thanks

PS I have an Accucel-6 charger from Turnigy, I might buy a second, but, this sounds like a cheaper option... for now
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Old Apr 12, 2011, 09:14 AM
Southern Pride
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Haralson County GA. USA
Joined Oct 2004
34,812 Posts
2S 1P equals 2 cells in series the 1P means 1 set ofcells in parallel which is what makes it confusing.

3S 1P equals 3 cells in series and the 1P same as above.

Years ago there wer no large capacitry LiPoly cells. Inorder to have a 3S (nonimal 11.1V ) 3000 mAh LiPoly required 9 cells of 3.7V and 1000 mAh each Such a 9cells 3000 mAh LiPolys would be listed as a 3S3P 11.1V 3000 mAh.

Cells in series increase volts , cells in parallel increase capacity (mAh).


Snip from one of the old Sticky post

Quote:
The naming convention that allows you to decipher how many cells are in parallel and how many are in series is the XSXP method. The number in front of the S represents the number of series cells in the pack so 3S means it's a 3 cell pack. The number in front of P means the number of cells in parallel. So a 3S4P pack of 2100mAh cells has a total of 12 cells inside. It will have the voltage of any other 3S pack since the number of cells in series determines the voltage. It will have the current handling of 4 times the maximum C rating of the 12 individual cells. So say our 3S4P pack had a maximum discharge of 6C. That means that it has a nominal voltage of 10.8 volts (3x3.6) and a maximum discharge rate of 50.4 amps (2100mAh x 6Cx4P ).

Parallel charging boards and harnesses are for charging more than one LiPoly of the same voltage (number of cells in series) at a time such as 2 to 6 3S 11.1V ones. They can be the same capacity or different capacities but must be close to the same state of charge (voltage) before connecting them in parallel.

All about parallel charging

http://www.rcgroups.com/forums/showthread.php?t=932319

Charles
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Last edited by everydayflyer; Apr 12, 2011 at 09:22 AM.
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Old Apr 27, 2011, 04:14 PM
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I does not matter if it is a 2P or not. What matters is all of the batteries have to be the S. Like 2S or 3S or 4S.
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