||I got one of these to test at IRCHA. My helicopter is a HDX 450 that was set up for 3S.
I changed the pinion, and put in a better ESC that could handle 4S.
The battery is almost the same size and weight as a 3S of brand X.
It has a Deans connector installed on a 4.5" 12AWG lead.
The balance connector is short and stays out of the way.
It balanced quickly and charged with no problems.
It changed my docile helicopter into a raging demon- still too much head speed, I need a slower motor now.
Anyway it had plenty of power, no sagging, and only a little warm after the flight.
This is a good battery.