I had the Dengfu e05 with m600 (smaller 48v battery compared to e10) and also had a light carbon with m500 43v with a Bafang btf04 battery. The range was so mutch better with the m600 Dengfu. I sold the Bafang battery and put the inside of the Dengfu battery in the light carbon frame. Much better!
Someone should 3D scan the btf03 cover so someone could print it. It’s strong enough for the job I think. Fabricate the mounting yourself and you’re done. I have the plate but can’t scan or print it.
The Bafang battery lets down a little.
I had the 600w 43v Bafang onepaired with m500 and compared tot the 600w 48v Dengfu battery paired with m600 the Bafang one lacked range a lot