can somebody tell me what the exact difference is between 2s1p and 2s2p (in lipo world)?

That is not realy dificult....

"s" means serial and "p" means parallel.

One cell of a Lipo has 3.7 Voltage. So that a battery with 2s (two cells) has 7.4V and a 3s (three cells) has 11.1V.

If you have a pack with two batteries a' 3s and 3000mA (means the capacity), than your battery pack has in total 11.1V (3s) and 6000mA (2p).

Best regards, Kay

In adittion;

The difference between a 2s1p and 2s2p pack is that the 1p pack has two cels of a certain capacity, and the 2p pack has four cels half that capacity. A 2P pack is essential made of two 2s batteries connected in parallel. This is done to achieve higher C-ratings (higher amps) at lower stress to the cels.

For example; you have a 2S1P 3000 mAh battery, and a 2S2P 3000 battery. The first one has two cels which deliver the current. The second one has four cels, 2x2 in parallel. The current here is divided over the two 'batteries' so each cell only has to deliver half the current. This increases battery life and max current delivery, in a 2P configuration you can pull a lot more amps from a battery with te same capacity.

For our use a 30-40 C rating will suffice, a 2P configuration is not realy neccesairy.

2s2p configuration:

Source: RCGroups.com

2s1p configuration:

Source: RCUniverce.com

Lex Verkuijl schrieb:
This depends on the boat! For example: if you have a boat with very little space for the batteries (e.g. Jupiter) you might like to use two 3S/1350 mAh batteries in parallel (= 3S2P) instead of one 3S/2700 mAh.

Jo_S schrieb:
You are right of course, that is also how the batteries in my Jupiter are wired. For my explanation I had a single batterie pack in 2P configuration in mind, but you can of course also make your own 2P configuration with two seperate batteries.

The same "problem" here, very little space for the battery!
So to upgrade the capacity of the 3S just buy 2 and a parralel cable from hobbyking!?

Kaiwofg schrieb:
Yes!