A good buy. Congratulations.
Turns out, they in fact had the correct E+ charger
I sold them that charger (with the E+ manual included) after the their first Ebay listing. I knew I would never go back to NiMH.
You should be able to recover the use of the NiMH cells, but if not, it's pretty easy( thanks to the work of Powell) to remove the charge boards from the front hub and mount into a enclosure. Then you can use any 36v Lithium battery and a standard front wheel and add disc brakes. If you looking to save, I find 18V tool batteries are best. Plenty of amps for the E+ The mount is easy to make or I can sell you one. There are also tons 36v batteries from impounded rental ebike showing up for sale. They are big, so rear rack mount, but have lot of AH and usually little use. They work fine, except if you push too hard on the hills. You have to live with power 7 or less, since their BMS won't deliver 1000W but that is not that big a deal. You can still do 28mph on the flat.