Plug the included DC power adapter into the (IN 5V) port. During this charging process, the red LEDs flash to indicate charge level, while the green light stays steady on. It takes between 4 and 6 hours to fully charge. Each method offers unique benefits and limitations, so understanding your needs is essential. For example, compatibility with specific batteries ensures proper functioning, while matching voltage. Unlike conventional storage options, a lithium-ion battery charging cabinet is specifically engineered to protect against risks such as overheating, fire hazards, and chemical leaks. Made with a proprietary 9-layer ChargeGuard™ system that helps minimize potential losses from fire, smoke, and explosions caused by Lithium batteries. In fact, it's generally better to avoid letting the battery drain completely.