Review on Artman Enduro Battery 1800MAh 2-Pack And 3-Channel Intelligent OLED Color Display USB Charger For GoPro Hero 11/10/9 Black - Fully Compatible With GoPro Hero 11/10/9 Batteries by Patrick Nepal

One of the batteries was DOA. Unfortunately, I didn't notice this until I actually put the battery in the camera, which was after the return time window.When I put the battery in the charger, the red light comes on like normal indicating it's low and charging. I never stood there and watched it until the battery didn't work. After I found out the battery didn't work, I watched the charger after I put the battery in it. After putting the battery in the charger, within about 15 seconds, the charger switched to green like it's done. After checking all the slots in the charger, the time varies from 2 to about 15 seconds before the light turns green. The time is random and the slot it's in makes no difference.The two batteries that still work, have about 2/3 the record time of the GoPro battery.