Do these need direct sunlight to work?

They charge best in full sun. In shade or on heavy overcast days they collect less energy and glow dimmer or for fewer hours after dark.

How long do they stay lit at night?

Run time depends on how much sun they get that day. A full sunny charge typically lasts several hours after dusk; a cloudy day shortens it noticeably.

They are made for outdoor use and handle rain and sprinklers, but they are not designed for submersion or standing water. Keep the solar panel clear of leaves and dirt.

Do they turn on automatically?

Yes. A light sensor switches the LED on at dusk and off at dawn, so you do not need a timer or switch.

Can I replace the batteries?

Most solar path lights of this type use a small rechargeable cell behind the top cap. Check that the housing opens before buying if long-term battery replacement matters to you.