How big a lawn can it handle on one charge?

That depends on the battery. With a typical 60V pack, expect roughly a third to half an acre; larger lawns are better served by a spare battery.

Is it worth it over a gas push mower?

If you want no gas, oil changes or pull starts and already own Toro 60V batteries, yes. If you have a large lawn or a tight budget, a gas mower still costs less up front.

Can it mulch and side discharge?

Yes. The 21-inch deck supports bagging, mulching and side discharge, so you can switch based on grass length and conditions.

Does it use the same batteries as other Toro 60V tools?

Yes. It runs on Toro's 60V Flex-Force batteries, which also fit Toro's 60V trimmers, blowers and chainsaws.

Does the mower come with a battery and charger?

Check the listing's box contents before buying. Some Toro 60V kits include a battery and charger and some are tool-only, and the product name alone does not tell you which.