The bike frame appears IDENTICAL to several other ebikes out there, like Dohiker, Excelvan, etc although the electronics are different. But the 7.5Ah battery is probably similar or identical.
In my ebike, the battery is easily removed by the user…the cover plate isn’t an issue. The battery pack has a connector on the end which can disconnect it from the ebike. The pack is a “standard” rectangular brick-like configuration with integrated BMS and shrink-wrapped covering the whole thing. Very common…very basic. Nothing special. There are multiple sources for such battery packs. You may find some “off the shelf” that fit the ebike. Custom sizes and connectors are even possible and from a decent supplier the lithium cells are reasonably priced even for high quality lithium cells ($3.50-$6.00 (retail) per cell, and UP TO 30 cells per battery pack). While at it, one can increase the battery capacity from 7.5Ah to perhaps 10Ah or MAYBE even 12Ah for a added cost. As long as the “36 Volt” battery pack fits in the tube, it has internal protection (a BMS) under the shrink wrap, and the connector can mate with the connector on the ebike then it’s good to go. You do have to be careful with shrink-wrapped packs as there MAY be small anomolous “bumps” from wires, the BMS or other sources under the shrink-wrap which MAY keep it from fitting in the ebike’s tube if you ordered a back that has dimensions that barely fit the ebike tube. Leave some space for such unless the manufacturer can guarantee it will fit AND has a money-back policy for packs that don’t fit within the dimensions you provide.

Some good points. The price is amazingly low. The wiring harness to the rear wheel has a quick disconnect plug. Vilano, for instance, does not have this on some of their ebikes. On them, if you have to remove the rear wheel, you are in for a heck of a job. I understand the EB-5 is very adjustable and even taller folks can set it up to be comfortable.

Thanks for the review of this ebike.