Cell 4 low voltage...

[Delarado]

HI guys,

I think ive answered my own quesition after reading another thread in this forum, but ive noticed that when I check the cells of my new 6s 5000 cells, cell 4 is considerably lower than the rest.

Im running a 700e align for 6 minutes. sport flying, a bit of 3d here and there but nothing massive. The packs are as follows:

3.785v 3.783v 3.784v 3.778v 3.782v 3.802v
29% 28% 29% 14% 28% 34%

3.785v 3.786v 3.784v 3.778v 3.782v 3.801v
29% 29% 29% 14% 28% 33%

Is the cell 4 low reading because of the bullet connector?

Packs have been "cycled" on my charger 10 times, 4.2v down to 3.86v and then hovered 3 flights and now flying normally.

[Andy from Sandy]

From the cell voltages you have listed there is a difference of 24mV to the highest cell voltage and a (massive, lol) 4mV to the next highest voltage from itself with regard to the first pack. I would not call either of these figures "considerable".

[Delarado]

Yeah thats a good point, I dont really know I just go on what my battery tester tells me, and 14% versus 33% kinda worried me, but i guess its not that much. 3.778v to 3.782v is as you say only 4mv, but my tester shows that as 14% difference which im not convinved it is?

In any case, i dont suppose its that bad. I just wanted to make sure i hadnt done anything wrong with the packs or such like!

What would you say are the sensible limits for connecting packs together in paralell as far as voltage differences go?

[helimadness]

Cells are never going to preform exactly the same. As long as they balance when charged and after use are within a reasonably tolerance Which .024v Im sure is within any manufactures tolerance you are fine. Not sure why your battery tester gives you such a big difference. What is it relating to?
If 4.2v is fully charged and 3v fully flat so 1.2v total range then surely .024v difference is less than 1% by a long way.

[Bronek]

If 4.2v is fully charged and 3v fully flat so 1.2v total range then surely .024v difference is less than 1% by a long way.

no itsn't. It's exactly 2%

I agree, nothing to worry about.