DIY USB power bank with up to 4x 18650 batteries recovered from laptop batter pack
У вашего броузера проблема в совместимости с HTML5
Bought this case from AliExpress
Has a nice LCD display and two USB charging ports. Takes up to 4 1860 batteries that need to be wired in parallel. Unfortunately there are no connectors for the batteries and therefore the batteries need to be soldered together. Overall an inexpensive product.
https://www.aliexpress.com/item/HOT-Universal-LED-Kit-Dual-USB-5V-1A-2-1A-Mobile-Power-Bank-18650-Battery-Charger/32527467930.html