I read an interview with a battery lawnmower manufacturer (I can't remember which one) who said their mower had been tested to last 450 hours. If you mow 2 hours a week for 20 weeks (May-September), that's 40 hours a year. So 450 hours would be 11 years.
Estimates of how long a battery-powered mower will last vary widely:
Bob Vila: 5 years
TotalGardener.com: 8-10
GardenToolExpert.com: 7-13
Insider.com: 10
TheLawnReview: 5-7
But there is agreement that the battery will last 3-5 years, although premature battery failures are widely reported in Amazon reviews.
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