Greetings!

I was wondering if I could mod my Mini-Z AWD MA-010 to use lipo batteries. So I ordered a 2S 300mAh battery and a UBEC 5v/5A.

I installed everything and it sometimes works. I'll explain myself. When the car is free of load, that's not on the track, the motor runs nice, smooth and faster than before. The problem comes when it is on the track, under load, and the motor doesn't want to start working. It's "coughs" many times and then it starts to spin, sometimes but only with the battery in storage mode. The curious thing is that with a fully charged LiPo, the motor just coughs, it doesn't get to spin.

As I could see, the Mini-Z ASF electronics can handle up to 6v, so the 5.4v that the UBEC is giving should be alright (even being more that I wished). Also, the motor shouldn't draw more than 5A being a 48T, unless the UBEC can't provide what it states.

Can you help me isolate the issue? With the AAA batteries it works ok, the thing is I want to get rid of them and use LiPos.

Thanks!