Review on 💡 Rechargeable RGB Backlit Wireless Gaming Keyboard and Mouse Set with 4800mAh Battery, Metal Panel, Detachable Hand Rest, Mechanical Feel, and 7-Color Gaming Mute Mouse for PC Gamers by Jeff Ross

So there were a lot of negative reviews about the battery. I had the same issue where it died and wouldn't charge even after being on the charger for 24 hours. If you understand batteries, you understand how difficult it is to charge and discharge a battery. So here is the solution. Use the keyboard until it dies. Then connect it to your computer with the included USB cable. Leave it on while using your computer for about a week. This will charge and discharge the battery enough times to fully charge the keyboard. Mine has been offline for over a week and is picking up speed. That's all. That works fine.