What can the Numax SH16VIPK inflate?

Up to 100 PSI, so car tires, bike tires, sports balls, air mattresses and most pool inflatables. It is not aimed at high-pressure items like some road bike tires near 120 PSI.

Does it come with a battery and charger?

Yes. The kit includes a removable 16V lithium-ion battery, a charger and a carrying case, so it works out of the box without a cord.

How does it compare with a 12V plug-in inflator?

It is cordless, so you are not tied to a car outlet, and it has its own gauge. A 12V plug-in unit runs indefinitely from the car but needs the engine or outlet and usually lacks a battery.

Is 100 PSI enough for car tires?

Yes for most passenger cars, which run in the 30 to 40 PSI range. The 100 PSI ceiling leaves headroom for most light truck and trailer tires too.

How long does the battery last per charge?

Numax does not publish a fill count. Expect enough for topping off several tires, but plan to recharge before a long trip or keep the charger in the car.