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Old Apr 05, 2010, 09:46 PM
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Richmond, TX
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Difference between 4S2P and 4S1P?

What is the difference between a 4S2P and a 4S1P pack? In other words, what does the 2P vs 1P mean and how does that relate to power, longevity, etc? Is one better than the other, etc?
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Old Apr 05, 2010, 10:04 PM
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United States, WA, Puyallup
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Picture worth many words. Set the drawing up for 4S and 1P, then 4S and 2P.

Power, longevity, etc depends on the cells. A 4S1P can have the same capacity as a 4S2P, depending on the capacity of the cells.

Note the explanation printed under the picture.

Bill
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Old Apr 05, 2010, 10:55 PM
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The P is for Packs, so a 4S2P is 2 4 cell packs. Now whether or not that is wired in series or parallel depends. Technically you can consider your regular lipo packs as a 1S3P for a 3 cell, or 1S4P for a 4 cell.
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Old Apr 05, 2010, 11:01 PM
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Originally Posted by Xpress.. View Post
The P is for Packs, so a 4S2P is 2 4 cell packs. Now whether or not that is wired in series or parallel depends. Technically you can consider your regular lipo packs as a 1S3P for a 3 cell, or 1S4P for a 4 cell.
Wrong. S is for number of cells series, P is for number of cells parallel (for each serial connection).

Naming conventions shown in sticky.

Mark
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Old Apr 05, 2010, 11:19 PM
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Quote:
Originally Posted by Xpress.. View Post
Technically you can consider your regular lipo packs as a 1S3P for a 3 cell, or 1S4P for a 4 cell.
Uh yeah, thats exactly backwards. 1S3P 1200mah, for example, would be a 3.7v pack with three 400mah cells in parallel. What would be more normal is a 3S1P 1200mah, or 3 1200mah cells in series, only 1 in parallel. It's kind of redundant to say 1 in parallel so the 1P is often dropped, unless it is more than 1.

The number before the S increases the voltage of the pack, the number before the P increases the capacity.
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Old Apr 06, 2010, 06:28 PM
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Richmond, TX
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Thanks for the replies. I have a better understanding now. The link provided by eBill3 is great. Same goes for the sticky provided by mrforsyth.

http://scriptasylum.com/rc_speed/_lipo.html

http://scriptasylum.com/rc_speed/_lipo.html


So, in comparing the two batteries below...not counting brand, price, or C rating, why would a person go for a 4s2p instead of a 4s1p (or vice versa)? Is there any benefit of having a greater number of cells (all other things being equal)?

http://hobbycity.com/hobbyking/store...idproduct=7656


http://hobbycity.com/hobbyking/store...idproduct=9463
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Old Apr 06, 2010, 07:32 PM
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I'll take the 4S1P. Usually lighter and smaller. There are fewer interconnects, which means less chance for that type of failure. And, if an interconnect does fail and a person is so inclined, much easier to rectify.

Not too long ago, 4000 mA cells were unheard of, therefore cells in parallel were quite common. Are the high capacity single cells of decent quality compared to lower capacity? I do not know - perhaps someone else has a thought on that.

Bill
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Old Apr 06, 2010, 08:19 PM
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Quote:
Originally Posted by EricJ320 View Post
Uh yeah, thats exactly backwards. 1S3P 1200mah, for example, would be a 3.7v pack with three 400mah cells in parallel. What would be more normal is a 3S1P 1200mah, or 3 1200mah cells in series, only 1 in parallel. It's kind of redundant to say 1 in parallel so the 1P is often dropped, unless it is more than 1.

The number before the S increases the voltage of the pack, the number before the P increases the capacity.
Lol, somehow my example got messed up...

Good thing there's more people here
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