Ray did it carry the weight of the 2 x 4000s ok sorry about all the questions but I'm starting to get a collection of lipos now trying all the different ones not to mention the cost cheers
No problem bud, ask as many questions as you want. That's why these forums exist, to help one another.
Remember one thing, the more weight, the more stress you are putting on it. I have put 2 X ms15200mah 15.2v on it too and it went out for rippling don't recommend It though. It does carry the weight but sooner or later something will break due to the extra stress, it could be motors, mb, she'll, etc.
That's why regular preventive maintenance and normal checkups is a must.
I would say start with small batteries and work your way up. You will know when you hit the limit. I want to say weight wise around 800g is the max you should go to.
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