Shure Rechargeable lithium-ion battery serves either as a replacement or as a spare battery to charge while using the GLX-D Digital Wireless System. Get up to 16 hours use on a full charge. The SB902 can be charged by simply putting in the built-in charging slot on the GLXD4 receiver.
The Shure SB902 can be charged completely in only 3 hours. If you're in a rush, you can get up to 90 minutes use after a charge of only 15 minutes!