did a thread ages back on this sort of thing after the battery jumper we had was left in a car after it being total it was a great one multi purpose could jump start a flat car battery and run pc in the wild etc to a amp or whatever took your fancy I replaced it with a .... not that had need yet of it but saying that the car we got now might need it right now though as could not get it to start last time we tried but ant been used in over three months as dads not been up to driving it (automatic )

NOCO Boost Plus GB40 1000 Amp 12-Volt UltraSafe Portable Lithium Car Battery Jump Starter Pack for up To 6-Liter Petrol and 3-Liter Diesel Engines : Amazon.co.uk: Automotive


they do diff power size and outputs ...