Help with my ESC/motors!

[Emerson]

I have a homemade boat that I have to launch on Saturday, but I need some help ASAP with a problem. Pretty much, when I push on the throttle, the motors run and then die off within a few seconds.

I have two Graupner speed 700 Race (9.6v) motors with a Victory series ESC and I interchange two 9.6v batteries, one is 3500 mAH and the other is 4200 mAH, both are NiMH.

At first, I thought is was the speed control and I talked to Montana Designs (the company that makes it) and they said it may be because it is set up for LiPo use and not NiMH, but then I plugged the motors directly into the battery pack, and I still had the same problem. I re-soldered the wire connections to the motors and I am using new Deans plugs on everything.

Could this problem be because of a bad connection somewhere in the system?
Again, I am leaving on Saturday and I am really trying to get this boat that I made working in the water by then.

[ED66677]

You said when you connect motor directly to the batt it spins for few seconds and progressively die? if yes, your batt are not charged!!!

[Emerson]

Yeah, thats what I thought until I tested them with my battery tester and they were almost 100 % full.

Anyway, after i posted my original message, i tried one of my brother's batteries and it worked! So you are right, it is something with the batteries that is causing this problem. Thank you for you help.

[Darin Jordan]

I'd check the balance of the batteries... check each cell to make sure it's actually charged... If one of the cells is a lot different than the others, you're charger will sense a false peak and say that they are charged when they aren't...

You can avoid this whole issue by going to Lipos!