My experiment shows how Eplus is restrained by NMH chemistry.
One thing is certain: E+ 3-phase motor has easy life powered by NMH.
Check this document by EMS.
http://mail-ems.com/E+_Electric_Battery_Tech.php
What destroyed and brought EMS to finalcial troubles was foolish decision to choose known for its viotale character LiPolimer cells in their B battery.