I have not been able to find a practical and reliable replacement for my hub battery, so I have reluctantly decided to abandon my E+ rig. I have accumulated a bunch of spare parts along the way, which I now offer to the readers of this thread. Please let me know if you are interested in anything by 23 May 2022, as I have to make room for other projects. I would be happy to supply additional details and/or photos to satisfy any curiosity. Powell has claimed the one working BMS board from the hub battery, which is probably the crown jewel. Here is the list of the remaining stuff:

[ ] Very tired hub battery, without BMS boards in Sunrims CR18 700C rim
[ ] Disassembled hub battery with bad BMS boards
[ ] 750W motor in 700c rim with disc brake torque arm & rotor
[ ] 750W motor with standard torque arm
[ ] 750W motor in Sunrims CR18 700c rim with disk brake torque arm and rotor
[ ] Complete wiring harness without brake levers
[ ] Complete wiring harness with brake levers
[ ] Wiring harness without throttle/brake segment
[ ] Thumb throttle with lead only
[ ] Brake levers without reed switches
[ ] 7-speed grip shifter
[ ] Misc Hirose connector parts
[ ] Battery connector cover (covers second battery connector of wiring harness)
[ ] LiPo battery enclosure & BMS board, thought to be good, but with no battery cells
[ ] LiPo battery charger
[ ] Usually working hub battery charger
[ ] Sometimes working hub battery charger
[ ] Dead hub battery charger
[ ] 3rd party 36V charger
[ ] 203mm disk rotor with E+ bolt pattern

My intent is to help keep any remaining E+ systems running, so everything is free, although I may ask for shipping costs for the big or heavy stuff. Thanks to everyone who has contributed to this thread.