Review on Optimized Motorcycle USB Charger with ON/Off Switch, Voltmeter, and SAE to USB Adapter (5V 4.8A) by Bret Wong

Charges my Samsung S7 with the screen always on and also charges two action camera batteries via the 2nd port. The power cord is a bit short, barely reaching the middle of my DRZ400S handlebars. I advise you to protect the device from water with a plastic bag when washing an electric bike. Rubber coating can be suitable for rain. USB devices do not interact well with water. The display is good, I can see the bike battery voltage (working or not) as well as the voltage and current going to each charger. I liked this item so much that I bought a second one.