Hi RobJames621,
Welcome to this group of nice people!
Some years ago, I switched to a 60 volt battery mower with manual & automatic variable speed for about the same size lawn as yours. I am quite happy to never have to mess with buying gasoline, filling it with gas, spilling gas on my hands, changing oil, figuring out what is wrong when it won't start, winter storage prep, etc. The 60 volt BLDC motor on my mower powers through heavy stuff with ease. I'm sure a lower voltage motor would also suffice well.
If you do go with battery, consider what other products use the same platform. You may want a leaf blower, a string trimmer, a hedge clipper and such. Another thing to check is cost of replacement batteries, both factory and aftermarket. (Consider also buying a spare) Sooner or later, the batteries will go bad. (For mine, over 6 years and still good.)
And, if you can, check one in person. Check how the handle adjusts. Does it have a position that is comfortable for everyone who will use it? Is the handle rigid or does it flop around? Does it fold flat quickly & into a suitcase shape for storage? Is it light enough to hang on a hook?
Can the bottom of the deck be hosed off? How many height settings are there? Can it mulch as well as bag? Is the bag easy to remove and empty? What is the warranty? How costly (and how available) are parts for when the warranty expires? Is the blade inexpensive?
Although my Cleva LawnMaster CLMFT6018A is a fantastic machine with all manner of handy features, I cannot recommend it. When I bought it, the mower was missing parts. The manufacturer would not send parts. Fortunately, I could make them in the machine shop. It also uses a proprietary blade which is not available. (For the record, the credit card company reversed the cost of the mower.) And, it was recalled in Canada because the blade can fly off. (Which was easy to solve with thread locker on the blade bolt.) The companion leaf blower is good, too- but it also came missing parts which Cleva would not send.
A feature to skip: Many manufacturers brag about a headlight so one can mow in the dark. How would one possibly see sticks, rocks and other potential projectiles in the dark?
Some people I know have Greenworks brand and some have Ego brand. All like their machines. I don't know if those are available where you live, but both may be worth checking into.
And, no matter which mower you buy- gas, battery or plug-in, be certain to have safety eye wear and hearing protection.
I hope this helps your buying decision.
Paul