Rear carrier battery
It’s portable to assemble and disassemble on/from e-bike. Rear controller make the e-bike more stable and balanceable.
Down tube battery
Fixed on the e-bike frame, no strict on frame and more flexible when choose frame.
Frame integrated battery
Battery hide in the tube and there is a top cover above it, which not only support integrated decal for whole e-bike but also support to protect battery from damage.