Come with one battery and the charger.
Pretty much every mechanic I've worked with has used one of these because they are just so durable. I've seen them fall countless times from 6ft heights, fall in drain pans with full of antifreeze, get pelted by welding sparks, and these tough little lights just shrug it all off and keep going.
This one I only used at home. Getting rid of it because I have tons of other rechargeable lights, am pretty careful with my tools so don't exactly need the durability, and trying to cut down on clutter at power outlets from tools that require their own specialized charger.
This one is HL(high lumen) version, rated at 640 lumen I believe. It has a high and low function, plus a strobe mode. It also has the upgrade of a tailcap switch, so it's basically now the same as the DS(dual switch) Stinger lineup.
Streamlight offers plenty of accessories for these lights, like adjustable holders and anti-roll pads. And if the flashlight were to finally give out in the future for some reason, repair parts are obtainable from many places and not too expensive. Official Streamlight batteries sell for about $20, but you can find 3rd party equivalents for half that or less. The charger even has a slot to charge a spare battery by itself, so you can just keep swapping to freshly charged batteries those times you need to use the flashlight all day.