@Dandare,
Without stating the obvious, you will likely find better results if you provide significantly more info for folks to advise from.
Existing battery tool you have already? i.e do you already have a bunch of Makita 18v, Ryobi 40v, Ozito 18v stuff
Bent or straight shaft preferred?
Size of property & type of usage anticipated? i.e 15mins work each time of light edging or an hour of robust rural work?