Get your battery energy charged up with the HB-D2 and keep the adventure going. The best portable battery charger is upgraded with a digital LED screen that displays real-time battery status, spring loaded battery contacts that allow compatibility with more battery types, and supports pass-through charging. When you’re on the go, the HB-D2 doubles as a power bank. With your own batteries, recharge with power capacity of up to 10000mAh+. Product Features: One button easy operation to navigate the digital LED screen, displaying real-time charging/discharging current and battery capacity percentage. Advanced high precision microcontrollers effectively prevent damage to the battery from reverse polarity, short-circuit, and over-current. Spring-loaded contacts safely support multiple battery types Low parasitic draw, perfect for use as a battery storage powerbank Supports USB-A and USB-C dual output Supports pass-through charging USB-C Input/Output supports QC 3.0 and PD 3.0 Fast Charging Standard For use with these rechargeable batteries: 18650 Batteries (Protected and Unprotected) 18700 Batteries (Unprotected) 20700 Batteries (Unprotected) 21700 Batteries (Unprotected)