Flightmax 5000 20c lipos

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Yes, unfortunately it's not wise to try and generalize as there are technical concepts that should be understood. As per lincpimp I run a 4000mAh 6S in my truck atm which gives me similar run time to what a 6000mAh 4s would as the 6S pack can deliver 50% more energy per second per amp than the 4S due to higher voltage. Good old P=VI. The 6S pack is 40C giving an amp output of 160 which is fine.

Generally it's best to figure out the amp rating for a pack and make sure its a bit over what you need to give some breathing space for various things.