2 articles on battery — guides, reviews and comparisons from the team that measures real lawns.
Buying Guides How Long Does a Robot Mower Battery Last? We Ran the Numbers A robot mower's lithium battery can outlast the mower on a small lawn — or fade in about 5 years on a big one. Here's the real cycle math, by lawn size. 
Buying Guides How Much Does a Robot Mower Cost to Run? Robot mowers sip electricity — most cost a few dollars a month to run. Here's the real math on kWh, your rate, battery life and total cost of ownership. 