Battery upgrade 36v:
Upgraded to 36v. Speed increases almost 50%, from 16mph to, nearly, 24mph. I have run 2 different bikes with no motor modifications, for 3000 miles each, with no problems!
I think you said the controller of pre-2008 (2007 and before) EZip are capable of 36v operation, is that correct? But more importantly, how does one know the birth year of the bike if bought used. Most likely the owner does not know it either. So, are there visual clues? serial numbers? or what?
When the opportunity presents itself, I intent to buy a cheap used one to try with a 10s laptop 18650 battery. Hopefully the higher speed, the lighter weight will erase the bad image I had when I tried the EZip about 5 years ago. I know the imbalance will still be there, but hopefully will be countered by the 10lbs or so of Lipo on the other side. Of course, there's nothing I can do about the noise.
2008 EZip Mountain Trailz (Blue) support 36V, 2 for 2. My 2008 Trailz (Black) did not.
Wait! ... Just double checked!
With the 36V (compatible), inside rack, there is a white PAS module.
With the 24V, the white PAS module is integrated in the controller.
This must have been the 36V compatibility "break point".
Easy, presumed reliable, indicator.
36V has been reliable, (3000 miles +),for me, but I typically run as an electric assist bike, assisting the motor.
As an "eaBike" I recommend the 34-11T freewheel-sprocket upgrade, otherwise you run out of "pedal" about 20 mph.
Even more important, if you, also, add the 16T mod - which allows 30 mph with heavy assist, or drafting.
Oh! ... humping along at 30 mph, wind whipping past your ears ... can't really hear the motor noise ...