To charge the USB port on a lighter, connect a compatible USB cable to the port and plug it into a power source such as a wall adapter or car charger. Ensure the lighter’s battery is compatible with the power output (typically 5V/2A). Wait until the indicator light turns solid or the battery icon stops blinking. Avoid using non-certified cables to prevent damage.

The USB standardization (USB-IF, 2023) ensures compatibility across devices, making it a common charging method for portable electronics, including lighters with integrated batteries. A 2022 study by the Consumer Electronics Association found that 65% of portable power devices use USB-C or micro-USB ports, reflecting industry-wide adoption for convenience and cost-effectiveness. Lighter batteries, often ranging from 300mAh to 1,000mAh (TechRadar, 2023), typically charge fully in 1-3 hours with a 5V/2A adapter, depending on the battery chemistry (Lithium-ion vs. Nickel-Metal Hydride). Using a higher-amp adapter risks overheating, potentially reducing battery lifespan by up to 20% (Battery Council International, 2021). Proper charging practices extend device longevity and safety, as faulty cables can cause short circuits or fire hazards (National Fire Protection Association, 2022). Always verify the lighter’s specifications and use certified accessories to optimize performance and avoid damage.