Have owned a NOCO battery starter unit for quite some time and it is one of the most useful bits of kit you can carry. The unit will start from absolutely flat a 12v unit up to 6.8 litre diesel and can be used 40 times on one charge. Also has a high powered torch, can also charge your phone. Bought mine from Amazon and on a very cold day with the battery flat it starts immediately. Only small in size, comes with a carrying bag and all instructions. Would recommend as an essential bit of kit