Checkout the reviews on youtube. Some are grossly overrated from their actual specs.
I keep a clarke jump pack in the car and even though its now 10 years old and i have not charged it for almost 4 months it still managed to start someones jaguar yesterday.
Unsure if i would leave a lithium pack in the car though. They can fail and who knows what the battery quality is like in those devices. Even major phone companies get dodgy lithium batteries.
A day of all things motorhome and campervan. The show is held both in the main indoor arena and across the grounds. Catering, hot drinks and food options are available. Easy access to the site and free parking included. Win one of five pairs of day tickets