This is a 10-pack of Zebra's PowerPrecision+ lithium-ion replacement batteries, each rated at 4300mAh, sized for the Zebra TC51 rugged handheld computer. Fleets of enterprise mobile devices like the TC51 wear through batteries faster than a consumer phone due to all-day, heavy-cycle use in retail, warehouse or logistics operations, so IT/asset teams typically buy replacement batteries in bulk packs like this one to keep an entire device fleet running rather than ordering single units repeatedly. PowerPrecision+ batteries also carry Zebra's own health-monitoring intelligence, letting compatible management software track individual battery wear across a fleet. This is a battery-only accessory, not a charging dock or the handheld device itself.