YaberAuto Car Battery Booster - Quick start, worry-free all the way. What can the YaberAuto YA40 battery booster do for you? Powerful and Reliable Battery Booster This car battery booster is equipped with two USB outputs, including USB1 (5V 2.4A/9V 2A/12V 1.5A), USB2 (5V 2A/9V 2A).