I just made this (very rough and ready) youtube video on my phone, to show you all this absolutely incredible, pocked sized device I was given with an Omega Purchase, and what it can actually do, especially when you drive an old barge. I genuinely never, ever believed this would be possible..........
Don't get me wrong. I wouldn't put much hope in it, but, keep it charged up, and it might just get you out of the brown stuff........
https://youtu.be/3Om5V8Y3haM
I've seen a few of these mini jump packs ,boosters about ,some as cheap as £50
I just keep a fully charged 075 car battery in one of the rear footwells
an 075 is big enough to start even an omega and will fit all the other vauxhalls in the fleet astras,corsa,zafiras
I have a few spare batteries ,so jump packs are an un-necessary expense
never had much luck with the older type jump packs that had tyre inflation on , never had enough power to jump something flat , hence I got use to carrying a spare battery .