ok. so my last controller died (the one that came originally with carrera) so bought a new one from amazon - Keenso electric bike controller for brushless motor. Also connected it to throttle. The issue is - when I push the throttle (even a little bit ) 1 to 2 seconds and the battery cuts out and what I understand gives the low voltage error(all lights blink fast) so connected it voltmeter. the throttling - voltage drops from 36V to around 33V and then suddenly to 28V and battery cuts out. if I connect to charger - it’s a steady 40V and I can throttle to max and it never cuts out. Any ideas? Thanks