Recently there have been a few companies trying 4S2P batteries. We thought we would explain whether we think these batteries will offer any advantage over a traditional 4S1P pack.
First let’s explain what makes a 4S2P different from a 4S1P pack. The classic 4S1P pack we are accustomed to has 4 cells in it, all of which are connected in series to one another to form a 4S pack we use for our quads.
A 4S2P pack has 8 cells in it. In this case, a pair of cells is joined together in parallel, and then these are in turn connected in series to produce a 4S pack.
For example let’s talk about a 1000mAh 4S. One 1000mAh battery would have half the max current capability of 2 1000s in parallel, assuming they all have the same “C rating”. This is because the “C rating” has remained the same, but the capacity has increased. Remember Max Current= Capacity x C Rating.
From this we can deduce 2 x 750mAh cells wired in parallel will have the same performance as a single 1500mAh cell, again assuming C rating is the same. This shows there’s no advantage to running 4S2P cells at all; in fact it’s a disadvantage for a whole host of practical reasons as well.
Firstly (and most importantly), as you go down in battery capacity it becomes harder and harder to make cells with high C ratings. Ever wondered why you can’t get high C rating packs for your micros? In addition, there’s greater chance of failure as there are more cells, it’s heavier due to increased wiring and it’s more expensive as there’s more cells!
As with anything related to quads, we can’t be sure the electrical theory will match up with real life. So once these batteries are released we will give them a go and really see if there is any beneficial performance.