If you’d like to avoid carrying around a 12 DC charger or faffing around with USB-C chargers, then you might like to try charging your i7 Book from a standard 5 volt USB charger outlet! Can’t be done? Well try this, for a cost of just UK£1 or US$1.5. It’s a 5 – 12 volt DC-DC converter.
https://www.aliexpress.com/item/USB-DC-5V-to-DC-12V-Step-up-Module-Converter-2-1×5-5mm-Male-Connector/32638868143.html
I didn’t think it would work but bought one to try and low and behold, it does work! All you have to do is change the supplied 12 volt DC plug to a 1.3 mm/3.45 mm plug which fits the i7 Book and off you go. It may not offer the fastest charge, but I reckon it would do a full charge in 6-8 hours maybe.