Can electric wheelchairs be carried on board?

Can’t!
Whether it is an electric wheelchair or a manual wheelchair, it is not allowed to push on the plane, it needs to be checked!

Wheelchairs with non-spillable batteries:
It is necessary to ensure that the battery is not short-circuited and is safely installed on the wheelchair; if the battery can be disassembled, the battery must be removed, placed in a strong hard packaging, and stored in the cargo hold as checked baggage.

Wheelchairs with spillable batteries:
The battery must be removed and placed in a strong, rigid packaging that is leak-proof to ensure that the battery does not short-circuit and is filled with suitable absorbent material around it to absorb any leaking liquid.

Wheelchairs with lithium-ion batteries:
Passengers must remove the battery and carry the battery into the cabin; the rated watt-hour of each battery must not exceed 300Wh; if the wheelchair is equipped with 2 batteries, the rated watt-hour of each battery must not exceed 160Wh. Each passenger may carry at most one spare battery with a rated watt-hour not exceeding 300Wh, or two spare batteries with a rated watt-hour not exceeding 160Wh each.