LIJIANI 18650 Power Bank Case Portable DIY Battery Pack

Multi-functional 18650 Battery Charger: Holds 4 batteries (0.7 inches in diameter, 2.56 inches in length), equipped with an LCD display showing battery voltage, current, and remaining power. Batteries can be easily removed to power other devices (NOT Included battery)
Type-C Dual-Function Fast Charger: Compatible with 3.7V/3.6V Lithium-ion Rechargeable Batteries, features dual output ports for convenient charging (NOT Included battery)
Dual-port Output Configuration: USB and TYPE-C ports provide 5V-2A output, long press the switch to activate the flashlight function (NOT Included battery)
Bad Battery Detection Function: If you load a bad battery, or the battery positive and negative poles are installed backwards, no battery symbols on the LCD display, only normal batteries appear battery symbols
Package Contents: Includes 1 M09 battery charger, 1 USB-C data cable, 1 instruction manual (Battery not included). Those unfamiliar with lithium batteries or lacking a DIY spirit should purchase with caution
Smart LCD Display Technology: Real-time monitoring of battery status with clear digital readouts of voltage, current flow, and remaining power capacity for each battery slot
Portable Power Bank Functionality: Converts your rechargeable 18650 batteries into a portable power source with dual USB outputs to charge smartphones, tablets, and other USB-powered devices on the go