Our EGO will be 5yo this June. Handling our St Augustine with zero problems. Our corner lot was slightly larger than what you will be mowing. You may have to charge at 3/4 mark or have 2nd battery.
Our edger, blower, and string are all ego with a smaller battery, so we could use the extra.
We are still on original batteries. You will mow once a week in summer, then 3-4 weeks during winter. Good tip from the lawn guru at Lowe’s in LL. Store your batteries in the house or you will be replacing then in couple of years.
We have since moved to smaller lot larger house with a pool, 20 minutes and we’re done.