electric wheelchair - needs new batteries (Scunthorpe DN15)

I bought this in 2003. It dismantles to get it in the boot. It is a 4mph scooter and it was ideal for me at that time. The batteries are flat and last time i looked them up they would have cost me £160. I started to walk again in about 2013 and it hasn't been used since. It shows how long it has been to get it reassembled i see that i have put the basket on the front in the pictures whereas it should have been under the seat.