This controller backlight lithium battery is the perfect solution for anyone seeking reliable and efficient portable power for their automotive needs.As a result of my tests I determined that this product is easy to use and highly effective, delivering a reliable power source that is perfect for everything from jump-starting your car to powering up your GPS or other devices. While the device is a bit bulky, the added durability and long-lasting battery life more than make up for any extra weight. Overall, this is a great choice for anyone seeking dependable power on the go..