Does the Kobalt KRS124B-03 come with a battery?

No. It is a bare tool, so you need a Kobalt 24 V lithium-ion battery and charger, sold separately. One 4 Ah battery is listed in the specs but not included.

What blades does it take?

It uses standard reciprocating saw blades with a tool-free clamp. An 8-inch high-speed steel blade is included, and any brand's reciprocating blade of the same type fits.

How does it compare with a corded reciprocating saw?

It is lighter and works anywhere, but corded saws generally cut faster in thick lumber and never need charging. For demolition, pruning and trim work the cordless convenience usually wins.

Is it good for cutting wood and metal?

Yes, with the right blade. Use a wood blade for lumber and pruning, and a bi-metal or metal-cutting blade for pipe and sheet metal. The two speed settings help match the blade to the material.

What is the anti-vibration system worth?

Kobalt rates it at 45% lower vibration than its standard design, which reduces hand fatigue on long cuts. It does not eliminate vibration, so gloves still help on heavy demolition work.

Can I use it one-handed?

It is lightweight enough for some one-handed overhead work, but reciprocating saws kick on contact. Keep both hands on the tool for demolition and plunge cuts.