My best advice to you is to know as much as possible about the wheelchair you are transporting.
It will have to be hold loaded but you will be able to use it as far as the gate. A 'dry cell' battery will come under lesser rules than a 'wet cell' one, but in either case the battery will have to be disconnected. It will also be of help to your airline if you can provide them with the weight of the chair (this particularly applies if you are travelling in a small aircraft).
In summary, most airlines will help you as much as they can, but the mroe info you give them the more they will be able to assist you.
Hope this helps.
Happy flying