Lipo Problem
 

Hi Folks,

I have a pair of 2S1P hard case lipo's to run in my new Nexx 8 (saddle pack configuration). The batteries are new and were only fully charged once before being used in the car for a few minutes for basic tuning at the track. I was doing some jumps and cased a double. It wasn't that hard of a landing, nothing close to a "crash", but my pinion gear did come loose so I decided to pack it in and go over the car to check for loose screws, etc. I noticed the balance wire on one of the batteries was damaged by the drive shaft (cladding pulled back but wire still intact).

Next day I went to top them off the battery with the balance plug problem gave me an error on the charger:

"BATTERY VOL ERR CELL CONNECT"

I get the same error using a different charger, cables, etc. If I probe the balance connector with a multimeter I usually get a few millivolts, but if I wiggle the connector sometimes it jumps up to 2v. The charger thinks 1 cell is measuring at 7.4v but the other is 0v.


On this brand the discharge and balance plug can be disconnected from the battery. So I was able to swap out every external wire and the problem remains the same and appears to be "inside" the battery, or at least the hardcase.


So I "think" there is a problem with the balance connector wire inside the battery pack. Perhaps the driveshaft pulling on the wire/plug broke a connection inside the hard pack. If that is the case, would it make sense to open up the hardcase and attempt a repair?

Anybody have any better ideas or things I might check? (I'm waiting to hear about possible warranty coverage but haven't been able to get a reply yet from the online retailer I purchased these from).

Rgds,

Joe

Def wait until you hear back from the retailer on whether you have warranty support or maybe some kind of crash based discount for a new one.

Some of these hard cases can be difficult to get into, depends on how agressive the manufact was in glueing or taping the lipo cells to the hard cases. I doubt it would be diff once inside to repair the damaged wiring, but getting there may be the issue. The one thing you can't let happen is puncturing the lipo cell membrane. Once that happens, that cell is compromised.

I've seen some cells from a hard case that were badly accordioned from a crash and damaged. This could be just be damaged.