120W Wireless Car Air Compressor Handheld USB Rechargeable Tire Inflator Digital Display Inflatable Pump Pressure Gauge Car Accessories Tire Inflator

Charged it fully until well after the indicator light on the charger cable turned green. Used it on a truck tire that needed inflating since they advertise it as doing up to 150PSI. Tire was at 32 PSI according to inflator when I started. I let it run for about 25 minutes. It didn’t get too hot to hold. I turned it off when the battery indicator got to only 1 of 4 bars left. I was doing this in my driveway not in an emergency situation and didn’t want to drain the battery fully. Truck tire had 49.5 PSI of the 65 I had set as the stop point. It took 3/4 of the battery and over 20 minutes to add 17.5 PSI to a 17 inch truck tire.Based on this I would say it has the full battery capacity to add about 23 PSI to a 17 inch truck tire. It comes with a USB to barrel jack cord that is only long enough for charging.Based on my testing I would not recommend this as the inflator you keep in your car for emergencies. I have a different brand with a battery but it also has a car power adapter with many feet of cord that you can run it off that ensures as long as the car as power I can run the inflator. Trust me you just aren’t going to charge the tire inflator’s battery every month. You are going to need it, find there is little battery left and want to plug it into a power source.I would recommend it for smaller tires like a snowblower, ATV, bike or small car where you had planned ahead and charged it. It is super lightweight so it might even be suitable for an on the go bicycle tire repair kit if you had a place to stow it. If you live somewhere where you know you need to add extra air to smaller 13 or 14 inch car tires tires in the fall as it gets colder and do so in planned manner and you only inflate to 32 or 35 PSI this unit could be helpful.I will use this in planned situations as a secondary inflator to speed things up when topping off car tires in the fall or as primary on the snowblower but it will not be my emergency in car inflator.