The Shure SB900A is lithium-ion rechargeable battery that works with Shure's PSM®300 (P3RA only), PSM®900 (P9RA only), PSM®1000, UR5 Portable Diversity Receiver, QLX-D® Digital Wireless Systems, and ULX-D® Digital Wireless Systems.
Dimensions (HxLxD): 1.25" x 1.98" x 0.67" (31.8 x 50.4 x 17.5 mm)
Charge Temperature: 0ºC to 45ºC (recommended)
Constant Charge Voltage: 4.2V
Constant Charge Current: 750 mAh
Nominal Voltage: 3.7V
Weight: 1.4 oz (39.7 g)
Rated Capacity: 1450 mAh