yes
points to consider though
it will run your battery down
the cigarette lighter plug and socket get VERY HOT ( ive had them melt )
for the price of a spare battery and a set of croc clips ( must be 45 quid ) is it worth it
you could also pop to a scrap yard and get a scrap battery for a fiver ( i know a few have done that here , i got mine for free, not intentional though, my 85 amp hour leisure battery dropped and cracked open on my drive, i took it to the recycling place as it was no good to me and they had loads of batteries in a pile, i took 1 of them, now that was recycling
)