The idea behind this design is to keep the power bank always charged when the car is running, so you won't have to worry about it being uncharged when you want to use it. The power bank's compact size and light weight make it easy to put in a pocket, bag, or even purse.

This 50W dual-port in-car USB charger with a portable power bank provides super-fast in-car charging. The USB-A QC 3.0 port outputs 20W, and the USB-C PD port outputs 30W max power. It can charge cell phones, pads, and laptops; it can charge two devices simultaneously. With a wide range of input voltage from 9V to 30V DC, it is suitable for use in cars, SUVs, Trucks, RVs, and Boats. It comes with a 2,600mAh power bank with a Type-C connector. 

• 2-in-1 Car Charger with Power Bank
• Dual Port Super-Fast Charger – USB-C 30W + USB-A 20W
• 2,600 mAh Pocket-size Power Bank
• USB-A super charging port output: QC3.0/20W Max (5V/3.4A, 9V/2A, 12V/1.7A)
• Type-C port output: PD 30W Max (5V/3A, 9V/2.22A, 12V/2.5A)
• Wide input voltage from 9V - 30V DC, suitable for car, SUV, Truck, RV and Boat
• Intelligent temperature control, input off protection
• Protection safety features - over-voltage and current, overcharge, over-discharge
• Stop charging when the temperature is higher than 158°F/70℃ or lower than 14°F/-10℃
• Storage temperature:  -4°F/-20℃ - 176°F/80℃
• If the product has not been used for a long time, remove it from the cigarette lighter to extend its life