Shure SBC10-903 is a single-battery charger

Features:

Compatible with the SB903 rechargeable battery
Charges 1 battery from 0 to 50% capacity within 3 hours (providing 4 hours of runtime), or to 100% capacity within 5 hours and 30 minutes (providing a full 8 hours of runtime)
Compact and portable
Powered via included power supply and/or USB-C cable

Specifications:

DC Input Voltage 5 VDC
Charge Current 220 mA (USB Powered)
Charge Time 50%: 3 Hours
100%: 5 Hours, 30 Minutes
Charge Voltage 4.2 V
Charging Temperature Range 50 to 113°F / 10 to 45°C
Housing Molded Polycarbonate
Power Supply Input Voltage Range: 100 to 240 VAC
Operating Frequency: 50 to 60 Hz
Maximum Input Power: 0.2 A at 100 VAC (Full Load)
Output Voltage: 4.75 to 5.25 VDC
Maximum Output Power: 1.0 A at 5 VDC
Charging Temperature Range: 32 to 140°F / 0 to 60°C

Shure SBC10-903 (Shure SBC10-903-US)