MG shuts down

[Rob77]

First time out with my MG lipos on order so borrowed my brothers venom 5000 7 cell nimh batteries. My question is the boat shuts down after about 3 min at most and then when you let off the throttle and try again it will go for about 30sec or so then same thing.

[PDR447]

sounds like your ESC is programmed for lipos and your hitting the low volt cutoff.

[Rob77]

I was thinking of that it must be programmed wrong from the factory. I don't have a card to reprogram it guess I will have to order one.

[dana]

your batteries arent supplying enough power. nimhs do not do well in brushless boats. the thing you can try is to drain or discharge the packs, then charge them at 1 amp. it will take all night but should get you going. you see nimh packs need to be fully drained and charged at a low amperage every now and then to refresh them.

[Rob77]

There new only charged 3 times so far.

[dana]

what amp did you charge them at

[Rob77]

5 amps

[dana]

no no no. you gotta charge new nimh packs at low amperage dood. i would have suggested 3 amps to start with. then after a couple of times you can go up to the 5 amp charge.

[dana]

try this, run them in an rc car or something and KILL them, like drain those suckers way down, then charge at 1 or 2 amps and see if that works. its the batteries not the esc

[Rob77]

There my brothers that's what he charged them at. I'm going to discharge them and recharge them.

[Fluid]

try this, run them in an rc car or something and KILL them, like drain those suckers way down...

This is terrible advice - DO NOT DO IT!!! If you discharge a pack of nickel cells down all the way, several cells will reverse and be RUINED. NiMH cells do not have 'memory' like NiCd cells did.

Balance the pack this way - after a run, charge them at 0.25 amps (or as low as your charger will go) and let it run overnight or longer. This will put a full charge into every cell in the pack and is the only way to truly balance a NiMH pack.

Be careful with some of the advice you hear on the Internet. It can cost you.



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[Nixhex32]

if the esc is set for lipos, nimh wills show low and the lvc will kick in, sounds like he needs to program the esc.

[dana]

whoops! my bad. sorry for the bad advise there. its worked for me is all. i was advised to do this by others and was successful. but w/e, no need to be a jerk about it fluid.

[Fluid]

Jeeze, I can't win. I try to emphasize something that will cost others money, then I'm called a jerk for doing it. The warning was not meant as a personal affront, but newbies have to be warned to be careful about advice they get on-line. That goes for all of us. Don't take one person's advice as gospel. Research it yourself, get multiple opinions. Most bad info is innocently given, but that doesn't replace damaged equipment.


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[dana]

i dunno man, i understand what youre trying to do, but the way you say it comes off like personal attacks. you could say things a little differently man.

[Rob77]

Well we ran the batteries in my brothers E-Revo they work great but not in the boat going to get a programming card and check it out.