Know this is an old post but if someone else needs to know how to get to the batteries on boreem jia remove the nuts at the bottom of the shaft holding the seat where it connects to the fiber glass frame and then remove seat and shaft and then four nuts "2 on each side" under the feet rest, you may need locate the tops under the boreem label by peeling it back to hold while untighting that's it, now you can slide the housing to the side be careful of your wiring only enough room to access and remove batteries. You will have to either cut or use soldering gun to free up the wires hope it helps
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Know this is an old post but if someone else needs to know how to get to the batteries on boreem jia remove the nuts at the bottom of the shaft holding the seat where it connects to the fiber glass frame and then remove seat and shaft and then four nuts "2 on each side" under the feet rest, you may need locate the tops under the boreem label by peeling it back to hold while untighting that's it, now you can slide the housing to the side be careful of your wiring only enough room to access and remove batteries. You will have to either cut or use soldering gun to free up the wires hope it helps