Running a makita dlm380 on 2x4ah batteries here on a 75m2 lawn.
Yes this mower is light and easy, can definitely recommend going cordless on that basis. It’s a joy. Just push it out and go mowing, makes it a quick job so I’m mowing more frequently and the lawn is better for it.
But your lawn is bigger. So I wouldn’t recommend going for any more budget brands. I’d go at least with makita, and probably one with a bigger deck than my 38cm model, otherwise you’ll be mowing all day.
As for batteries, I use a quarter of the 2x4ah batteries to do 75m2 to do a light mow. Sounds like you might want 4 batteries at 4ah or the biggest 5ah. You’re gonna be in for nearly a grand for one of the bigger deck mowers from makita plus 4 batteries.
Might be worth it.
At that point, worth looking at the other premium brands doing cordless like stihl. I’ve no experience to offer there.