To charge a desk lamp without a standard charger, use a USB port or wireless power methods. First, connect a USB cable (if the lamp supports USB-C, micro-USB, or USB-A) to a power source like a laptop, wall adapter, or power bank. Ensure the cable matches the lamp’s input specifications. For wireless charging, place the lamp on a Qi-compatible pad near a router or smartphone charger. Check the lamp’s manual for compatibility.

Wireless charging relies on electromagnetic induction, where a pad generates a magnetic field to transfer energy to a receiver in the lamp. USB charging uses standardized power delivery protocols, such as USB-PD, which supports up to 100W. According to the USB-Implementers Forum, over 60% of modern consumer devices include USB-C ports, enabling universal compatibility. The Wireless Power Consortium reports that 70% of smartphones and 45% of lamps now support Qi wireless charging. However, wireless methods may be slower and less efficient than wired connections. For example, a 2022 study by the Journal of Consumer Electronics found that USB-C charging reduced lamp battery charging times by 40% compared to wireless alternatives. Always verify voltage and current ratings to avoid damaging the lamp.