I have a Hyper 9e,tekin 1900 combo,4s 5000mah lipo and an older spektrum receiver linked to an Airtronics M-11. My 6 year old Jr 9100s had a lot of slop around its center so I decided to get a Savox 1258tg. Bought it,plugged it in,mashed the throttle,turned the wheels and the receiver light went out. Then I installed a Spektrum power cap....problem solved. I practiced all day with it today, not one single glitch.