So I have a Venom hump pack that had the negative wire pop off the connector. I got a new traxxas connector and tried to solder it to the wires attached to the battery. It did not go well. It was a sloppy job but I was able to do it (after a few tries) and was able to get it connected and charged. When I tried it on my Stampede it was going at about 25% power. It is an older battery so i don't know if its the battery or my garbage solder job that is the problem. A) Is there a way to test a NiMH battery to see if its working properly? B) Can a mess of a solder job be the cause for the lack of power?