Powell,
I'll watch SoCal for an 1000W EPLUS for you. Have you tried the 800 or 1000w Chinese hubs kits? Not as quiet. Control is good but not as sophisticated. Wife and I have 2000 miles on a tandem (36v 800W) with no issues. Lots of weight and big hills everywhere. If something breaks, $200 get you a new hub,wheel, tire, and controllers. Of course, we're in sunny Cal, retired and don't have to go out in bad weather. That's the key.

Thanks for setting me straight on the EPLUS hub motor. Is there a discussion of the EPLUS motor design online? I need an education.

My addition of the LI-NiMnCo tool batteries in parallel with the NiMH front hub battery has work out very well with no issues after several hundred miles. More range and speed than I can use.

I used the E+'s battery B red/black leads with a manual switch on the red. It seems to be a straight parallel connection to the 36v hub battery. I turn off the switch when parked, otherwise the NiMH tries to charge the LI Ion; just a few watts but it's wasteful. The battery B's data connector is unconnected and the controller seems happy with that. The display reports only the output and SOC of the hub battery. It never exceeds 300watts, even when the motor is certainly pulling over 1000W. The 2s2p tool batteries can are rated at 60a @ 36V so most of the load comes from them.

The question. The original design, was the optional B battery used at the same time as the A hub battery? Could you switch and use just A or just B or both? I suspect both had to be used together in parallel. I love to find a circuit diagram.