Cordless or petrol hedge trimmer (Pokesdown BH7)

Hi, I'm looking for a servicable cordless hedge trimmer to tidy up the alleyway by where I live.
( It has to be cordless as the hedges/bushes/trees are over 150 yards from any power source.)

(I'm pretty mechanically minded, so if it doesn't work I might be able to repair it!)

Ta muchly, Reg