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Lipo voltage

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Tony Read 229/07/2010 10:42:25
965 forum posts
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I confess to being a tad confused when it comes to the labelling of lipos. I know that a 2S pack is 7.4 volts and a 3S pack is 11.1v, but what about a 3S1P pack? Surely the 1 cell wired in parallel (which I believe this means) still gives a voltage of 11.1? Or is this a 14.8v pack? Help!

Bruce Richards29/07/2010 10:45:41
1849 forum posts
3S is just a short hand for 3S1P so they are exactly the same thing. It is a bit strange to say 1P because how can one cell be in parallel with itself thats why most people just say 3S.
Tim Mackey29/07/2010 10:54:18
20920 forum posts
304 photos
15 articles
Tony...have you read THIS
Heres an extract.
"Another of the great things about them is that we can happily join identical cells together in either series or parallel, or indeed a combination of the two, whereas this practice is not recommended for the older type of nickel based cells.
This combining of cells in various configurations is where the pack designations come into play. If a 4-cell 2100mAh Li-Po battery is connected in Parallel to another identical battery this results in 4 cells in Series, and 2 batteries in Parallel, or, in other words 4S 2P. The nominal voltage remains the same as one battery, which in this case (4 cells @ 3.7V each) would be 14.8V. However the capacity is doubled and this newly formed 4s 2p battery now  boasts 4200 mAh capacity. To increase the volts, we join in Series, to increase the capacity, we join in Parallel. Combining both increases both."
There is also full explanation of S and P configurations in the July 2010 magazine.
Tony Read 229/07/2010 15:51:04
965 forum posts
3 photos
Errr, so a 3S1P pack is 11.1v? It was sold to me by a trader as 14.8!
David Ashby - Moderator29/07/2010 15:55:42
10947 forum posts
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614 articles
Should say on the label Tony? 
Reno Racer29/07/2010 16:22:44
1138 forum posts
168 photos
I'd go back to the trader if you wanted a 4S lipo, he/she has clearly mis-sold you. Was it a reputable RC shop?
Tim Mackey29/07/2010 19:01:17
20920 forum posts
304 photos
15 articles
Posted by Tony Read 2 on 29/07/2010 15:51:04:
Errr, so a 3S1P pack is 11.1v? It was sold to me by a trader as 14.8!

 Yep, 3s1p is merley 3s - which is 11.1V nominal.

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