How hot should NIMHs get?

[R.C.Hole]

Anybody have an idea how hot NIMHs should get?
I'm running a D4 with a 5700kv brushless (approx 6T) on a 7.2v 4000mAh pack and depending on the surface I'm running on I can burn myself on it (even worse with my old brushed 15T).
I only bash for now and its the only pack I've got so i don't have experience with lots of batteries.
Also does anyone know a max safe discharge rate (before you start to damage them) all Lipos have it marked on them but I can't find any info for NIMHs;

Any help would be great.

[ianhaye]

you shouldnt burn youself from the batterys thou its ok for the to get hot after a hard run, sounds like your motor is pulling more power than your batterys can handle, whats you motor temps like?

[R.C.Hole]

My Brushless temp is ok, never gets too hot. The wierd thing is I'm only running a 18T pinion and there's still sod all punch, top speeds good but it's crap on start up (for punch my brushed was better).

Shouldn't NIMH be able to handle brushless? Or is mine screwed?

The problem is my brushless is sensorless and if you go hard on the throttle from a stop it just stutters -you have to really roll the throttle to get it to start.

At the moment I'm running without a shell, I've tried putting it on and the batteries just cook!

[ianhaye]

u sud no way have to run without a shell, just a thought but how hot do they get when being charged? how old are the batterys and have been sitting for a while, if u can check each cell with a voltmeter and report back you findings.

[R.C.Hole]

Now and then they get really hot when charged but recently they haven't even got warm.

They're orion sport 4000s and I went to orion's site and they have a new sport battery range now, mine are from the old range but I don't now how old they are.

I checked the voltages a while back after running and they seemed fine and they're all the same.

Any suggestions?

[ianhaye]

i would try and borrow a set of battery of someone and give them a try bud,