This is where good lipos should have a label with relevant info on it.
While most, if not all branded lipos are good we have found that for stock classes, batteries with lower internal resistance give more punch.
In mod it doesnt make much of a difference but in stock classes it definately helps.
casterracing EX-1 Pro, SP Silver Arrow
TOP Racing Scythe, SP 17.5, SP GT Pro 2.0
TOP Racing Scythe, SP 4.5 V2, Hobbywing Xerun 120SD 2.0
TOP Racing Scythe, SP 13.5, Hobbywing Xerun 120SD 2.0