I have a Rilu model D-30. Bog standard electric bike at the cheaper end of the market. Comes with pannier racks and the battery is under them over the back wheel, and is easily removable but can be locked in place with a key. Only downsides for me are that you can’t have a front handlebar basket, and the built in rear light is a bit fragile, so I use my own lights. I also had an issue at the start where the back wheel couldn’t cope with a really heavy load of shopping and collapsed, but I believe this issue has now been fixed for this design. I have a milk crate permanently wired to the pannier racks which fits an Aldi cooler bag and my handbag & shopping goes in that to limit the load. Had it 6 years now and still using the original battery. I get 80-100 k from one charge using mid range power. Ride it every day to & from work - About 15 k round trip plus shopping & fast food trips. Designed and built in Melbourne from imported parts.