Last Saturday with 4 min to go before the race started I went to plug the battery in on my stock Slash and the wire broke off the Traxxas connector. While trying to get the terminal out to solder it back on, I broke the other wire off. I got both terminals soldered back on and plugged the battery in and nothing. Upon closer inspection, in my haste to make the race I soldered the wires backwards. I slid the connector apart and put it together properly and still nothing. I figured that connecting it backwards must have blown the ESC.

This morning I was checking things out and found the problem is with the battery. I put a different battery in the car and everything seems fine. The battery is a Tenergy 2s 5200 30c. I hooked the battery to my charger to see if it was dead and I get a warning “battery voltage to high”. I put the charger in balance mode and it reads 4.19v on one cell and 4.51v on the other. If I check the battery with a volt meter it reads about 8.2v, analog not digital.

I thought that if I could drain the battery a little then the charger would balance the cells. I tried to discharge the battery with the charger and get the same error message. So I hooked it to a light bulb and it won’t even light, I hooked it to a motor and nothing. But yet I am reading over 8v.

Anyone have any ideas to try to revive this battery, It is only 3 weeks old.

Thanks
Keith

Are you sure in your haste to get it put together, you didn't short it somehow even for just a moment?

The only time I've see a lipo cell read more than 4.2v is when it has gone bad. As soon as you put any kind of load on it, voltage falls to next to nothing. Your testing bears this out.

Appears that whatever happened was fatal and this lipo is ready to be replaced.

You may have some more bad connections on the pack.