The thing is scrap! It only outputs 7 volts, which is not suitable for charging more than 20 volts from a lithium ion battery in a Samsung robot! Judging by other reviews, this is a common problem!
Robot vacuum cleaner Roborock S5 MAX Global, black
298 Review
Xiaomi Mi Robot Vacuum Cleaner 1S Global Robot Vacuum Cleaner, white
389 Review
Xiaomi Mi Robot Vacuum-Mop 2 Lite RU robot vacuum cleaner, white
198 Review
Dyson V8 Absolute: The Ultimate Cordless Vacuum for Effortless Cleaning
142 Review