Ive looked at battery but can't pull the trigger. To hesitant on reliability vs gas mower. We built our house in 1996 and I've only had 2 push mowers.
If you're buying a new mower anyway, battery powered is definitely worth a look. Capabilities improve every year. Also, if you already have batteries, the mower alone might be cheaper than gas models.
I've been using an
RMA 510 (not self-propelled) mower for a year. The mower and AP300S battery were about $250 each. I added it to my equipment list on a whim so I didn't have to mix fuel and replace starter cords. I'm very glad I did. A big plus is the simplicity of starting and stopping (to hand weed, move obstacles, talk with neighbors, etc.) It's very quiet and has at least as much power as my old Toro. The battery lasts well over 30 minutes for routine cutting. An onboard caddy holds a spare. There's not really much to go wrong -- it's basically a battery, switch, and motor.
I have had both a switch failure and motor failure on my trimmers (each fixed under the 3-year warranty) but the mower doesn't need such tiny components and I expect it to me more reliable. Neighbors appreciate the quiet operation. As I mentioned, this was the one item I questioned the need for. I no longer have doubts.
Finally, if you've never tried out any current generation battery powered outdoor equipment, ask a neighbor to let you test theirs. All of my Stihl battery tools outperform the gas models they replaced. (I don't store the batteries in my shed or garage where it gets really hot, though.)