I just aquired an 11.1v 800mAh (3 cell i think) li-po and i was wondering if i could put it in my 1:18 rc18t in place of the stock 7.2v 11oomAh ni-mh battery. My motor is a 5800KV brushless and my Esc is rated at 20A, 12v and is li-po ready upto 3 cells so i can't see why it wouldn't work but it is physically smaller than the stock battery. Does that matter?

Also apart from a proper charger what else do i need. For example BEC, balancer, discharger etc. As you can see this is my first li-po and electric car

Thanks, any help would be great