2x 2s lipos in ebuggy and cell 2 dumping first in both!!
 

hey guys i am running an xerun 150a esc and 2 2s gens ace 5000mah 40c batteries. i know the batteries are in good shape because they balance out fine every time. it seems that my 1/8 ebuggy is pulling more from cell 2 in both batteries causing the battery to die too early at about 10 minutes when i normally get about 15. i had a cut up y adapter on my esc series connector when i first noticed it. i recently replaced that y adapter along with new deans on both the esc and batteries. this problem is still happening. only solutions i can think of is maybe resolder everything due to a cold solder somewhere or maybe the 12ga wire i used for the y is too small compared to the 10ga everything else uses. not really sure. anyone else ever have this problem or have any solutions? thanks

I assume the batteries are in series. Switch locations of the batteries and run it a couple of times so we can see if things change.

yea i just thought of that actually. yes they are in series. i ran the wires to opposite batteries so lets see what that does. i'll post back soon

hmm that time i switched the connectors and one battery was fine at 3.77 in each cell and the other 3.77 and 3.00! what is goin on here

Could it be that one cell in each pack has higher resistance than the other, causing more current to be drawn from the other cell which discharges that cell faster.

When you charge it how quickly do the cells balance out?

they balance out pretty quickly for being off by about .7v.

All cells in a series get the same current. I believe you have a 1 or 2 "small" cells (by comparison).

I tried a good turnigy battery paired with each gens ace and the turnigy discharged fine. Im thinkin its my gens ace batts

This is characteristic of a small capacity difference being ran slightly below the "knee" of the discharge graph since there's very little capacity difference at low voltages. (lots of voltage change, little capacity change below about 3.6 volts or so)

is this enough evidence that i need two new batteries?

no, not by itself. It would, however behoove you to get them checked out real well.

maybe its even a connector or esc issue?

I use 2s in series also. I have 6 pairs of Nano's that I run using 12g wire. Have you tried discharging both seperately and then re-charging to see what happens.
I also run the Hobbywing SC8 in my buggy

one way is it to charge/discharge on a charger to check the IR of each cell,as said before it could be to high causing one cell to drop faster than the other

IR is cumulative and affects the series pack as a whole. It is nearly impossible (the way we use packs) to pull more capacity out of any one cell when they are connected in series.