Backup/replacement rechargeable lithium ion battery pack for Motorola® Radius VL series and Spirit CLS series 2-way radios. This battery is the same battery that comes with the CLS radio.The battery charges in the same units as the radios, and delivers up to 10 hours of battery life in a single session--more than enough for most work shifts. So don't risk running out of juice at the worst possible time and pick up a backup battery today. These are such a low cost, keeping a few spares around make sense today. 3.7V, 1800 mAH Li-ion battery.