OK ! Now I understand !
I have a sticker on the box that says: ''The electronic speed controller (ESC) on this model is Designed to operate-with 7.2v 1800 mAh - 3600 mAh Ni-MH battery only.''
If I put a battery 7.2v 5000 mAh Ni-MH, I could damage it or not ?
And if I want to use Li-Po ... I need to change what parts?
I have a charger ''Duratrax ONYX 100''. Is it good for a 5000 mAh ? And for a Li-Po ?
It is true that longer runtimes can mean shortening the life of the motor or the speed control
But if you get a 5000mah battery, you can simply run the truck for 10 minutes, then give it a 5 minutes to cool down and then run another 10 minutes on the same battery.
The exp volcano is a decent truck, but the ESC and motor are just OK. To add runtime and power you will want to upgrade down the road.
You can find traxxas xl-5 speed controls on ebay for $25-$30 used all the time. That ESC can run 7.2-8.4v and handle longer runtimes. The motor can be upgraded to a traxxas titan 12t, or a losi 12t, or a ecx 20t motor.
If you want to run lipo (and you dont with the stock motor and esc) You need to upgrade the motor and esc.
There are brushed esc's that you can safetly use a lipo with.
But if you upgrade, it makes sence to spend a few extra bucks and go brushless.
A ezrun 35amp brushless system (basically what you get in the brushless volcano epx pro) is $75-$80.
Also, you can ad a fan to the esc, and a heat sink to the motor. these can keep temps down by 10-20 degrees. That will make it safer to use a battery with longer runtimes.
The onyx 100 charger is certainly better than the stock wall charger that came with your volcano.
But it can only charge @ 2 amps (when powered by AC, house plug)
The amount at which you can charge a battery depends on the capacity.
A 2000mah should be charged at 2amps (you can charge at less, but it will take longer.) Any more, and it can damage the battery.
A 5000mah battery can be charged at 5amps. This will give you about a 1 hour charge time. 2amps will give you a 2-3 hour charge time.
So, you certainly can charge a 5000mah battery with your onyx.
But a thunder ac6, onyx 230, onyx 235 will work better and faster.