3Pcs 5V 1A/2.1A Dual USB Lithium Battery Charging Board with LCD Display Output Charger Module DIY Charger

Specificatons Input charging voltage DC 5V 1AInput battery voltage DC 3 7V 4 2V Polymer Rechargeable Lithium BatteryOutput channel 2CHOutput voltage 5V2 1A 5V1AOperating Temperature 20℃ 85℃Operating Humidity 5 95 RHButton Function Double click to turn ON OFF LED flashlightModule Size 66 21 15mm Features 1 Support LCD Display2 Support discharge while charging 3 Support dual USB output4 Automatically turn off the backlight after 30second Note 1 2 1A is the max output current It is not a constant current power module Its output current change by load It can not keep output 2 1A fixed 2 Old and new batteries can not be mixed 3 The battery cannot be reversed otherwise the module will be damaged 4 Please check the battery voltage first If the battery voltage is lower than 3 2V the module will not work properly 5 Please input from Micro USB socket to activation module at first before connect battery Frequency Asked Questions 1 What kind of battery to choose Q It is used for lithium battery Battery can not be built in protection board The following battery is not suitable Old battery New and old batteries Different capacity batteries Different brands2 Why no output voltage Q Please input voltage from micro USB if there is no output from standard USB after connect battery 3 What is the conversion efficiency Q About 80 for new real battery 4 Why does the charger lose power or shut down automatically Q Poor battery quality high int