I purchased a Lokithor JA302 battery jumper and air compressor after reading this thread, thank you everyone. I started out looking at the pure battery jumper models and discovered the Lokithor combination. Finding air on the road at 30 deg F after leaving home at 80 deg F has proven to be a big hassle. Portable compressor reviews were always dissatisfying and so we struggled for years.
The Lokithor's reviews were lower than pure battery jumper models because a problem can occur in either component, jumper or compressor. BUT... solving two issues in a small affordable package was too seductive.
I can not comment on the battery jumper feature because I just purchased 850 CCA batteries for both my trucks this winter after my dealer said they were weak.
The air compressor worked very well. I pumped two OEM LT tires from 72 psi to 80 psi and used less than half the battery capacity with the tire air pressure increasing each psi in less than a minute, i.e. each tire topped off in around 5 minutes.
The Lokithor charges using a USB C cable which is included but does NOT include a charger. I have a laptop with a 18 watt USB C charger which charged the Lokithor in a reasonable amount of time, 3 hours for 75% of the battery (started at 25% full). The inverter I carry in the camper is rated for 120 watts and so the laptop charger could be used on the road. My inverter also has a USB 3.1 charging point rated at 15 watts which works on the Lokithor but is obviously slower. All these numbers are my best approximation and are not considered "accurate".
Hopefully my new 850 CCA gold/platinum/diamond... (standard not AGM) batteries will not need to be jumped anytime soon.
Over the years, I have had several tire leaks on the road but never a jump (knock on wood) because I replace my batteries every 5 years. So... the compressor is a very nice feature if the Lokithor proves durable especially given seasonal temperature declines.
Edited by iowahiker, 02 April 2022 - 09:11 PM.