Features Auto Charging: Charge the battery when there is power, and automatically use the battery to supply power when the power is off. The battery automatically charges and discharges. Good Protection: With input reverse connection protection, overheating protection, over discharge protection and short circuit protection. Wide in Utility: Can work as power supply, battery charger, mobile power supply, power conversion, infrared alarm, switch and other network equipment, router, battery car modification, etc. Stable Working: Able to step up the input voltage to charge the battery, the battery charger module can provide you with uninterruptible power supply. Easy to Install: Designed to have a light weight and a compact size as well, the installation of this boost charger board is very convenient. Specification: Item Type: Battery Charger Module Material: PCB Working Voltage: DC 5.0V-12.0V Output Power: 12W Maximum.  Support Battery: 3.7V lithium or polymer battery 15Ah maximum, not included.  Operating Temperature Range: -40℃ ~ 85℃ Operating Humidity Range: 0% - 95% RH Product Size: Approx. 49.8 x 19.7mm / 1.96 x 0.78in Application: For power supply, battery charger, mobile power supply, power conversion, infrared alarm, switch and other network equipment, router, battery car modification, etc.  How to Use:  1. Connect the correct input voltage to the input terminal. 2. Check the output voltage with voltmeter and ammeter. 3. Connect the battery at B+ and B-.  4. The DC UPS 12V 12W continuous power supply control board is used to design continuous power supply for network equipment such as routers, switches or infrared alarms. When the battery is fully charged, the upper limit can output 1A current. When the battery voltage is about to be emptied, 8-9W power can be output. When the output is short circuited, it will automatically shut down. After recharging, it will recover.  Package List: 1 x Battery Charger Module Package List 1 x Battery Charger Module