Review on YCCSKY Rechargeable Battery Pack for Xbox One - 2 Pack, 1200mAh Controller Battery Pack Play 🎮 and Charge Kit for Xbox One S/X/Elite Controller with 3FT Micro USB Charging Cable and LED Indicator by Bryan Reed

It took me almost 10 minutes to figure out how to connect these things without damaging the controller. Now the process has been reduced to around 30-60 seconds. The battery life is slightly increased. One lasts 20-30 hours and the other 10-20. The battery gauge on the Xbox never shows the battery is fully charged and shows the battery is about 50% charged when it is in the process of being discharged. Very strange.