I have a battery Ryobi sprayer, I think it’s P2840 4gal (they have a lot of models). I’ve used it for kocide and sulfur but nothing like surround. with just the nozzle it came with. it doesn’t really atomize, it’s more just a steam of big droplets, but that’s what I want so I have less chance of spray drift
sorry I don’t think this is enough info for you because surround would be a harder task than what I’m doing. but I’m happy with it
I used this (edit: non-electric; though the company does make them) one this year to apply potassium bicarb, spinosad and neem oil:
Worked pretty well. The pump/mixing lever worked fine and seemed to keep stuff mixed up sufficiently—including the neem oil emulsion. Beat constantly pumping, shaking and making trips to refill my el-cheapo two-gallon hand sprayer. Don’t know how it would handle Surround, as far as clogging, as I did not apply any this past season; seems to have a pretty good filter system, though. Stream and coverage were good for what i wanted it for: spraying cukes and melons.
I have the Harbor Freight $30 one… I dont really need a battery or anything fancier. Does what i ask of it. If and when it fails i will have no regret getting another one. If i had to make a living with one i would probably get a Stihl