The AA/AAA NiMH Smart Slim Travel Charger with USB Plug is an excellent choice for charging rechargeable AA and AAA batteries. The V3299USB model by Carrera is built to ensure that your batteries are never overcharged. This smart charging system charges two or four batteries at a time, and a built-in USB output port is designed to charge handheld devices, including mobile phones, PDAs, iPads, gaming devices, and more.

The charger comes with an input of AC100-240V, 50/60HZ, and 9.5W, and the output is DC 2.8V AA 600mAx2 / AAA 350mAx2 / USB 5V 500mAh. The charger has a world-wide voltage adaptation, making it perfect for those who travel frequently.

The V3299USB charger features two LED lights that indicate the charging mode. The red LED light turns on when the charger is in quick charge mode, the flashing LED indicates bad cell detection, and the red LED turns off when the charging process is complete. The green LED light on indicates that the USB port is ready to use.

For safety, the charger is equipped with temperature sensors that prevent overheating, and it also comes with reverse polarity protection. The charger has a convenient flip-out plug and is ultra-light and compact, making it perfect for travel. The charger is also ETL listed, ensuring that it meets safety standards.

It is essential to note that the USB socket can only be used when the charger is plugged into the AC outlet and no batteries are charged. The USB socket cannot be used when the charging process is running. When the green light (USB) turns on, the USB socket is ready for use. It is also important to ensure that the maximum loading does not exceed 500mA on the USB socket.