I have one of these and they are amazing it’s about the same size as my phone iPhone 7 Plus but thicker, very lightweight it starts my car no problem, even if the battery is that flat that there is no sign at all of life! And only £29.99 my friend has been using a similar make for over 12month in a garage and found these cheaper ones that are the same. If it helps you once it could pay for itself.
https://rover.ebay.com/rover/0/0/0?m...2F272343099971
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2002 S8 silver with black half leather
2000 d2 S8 in Racing green pearl, RS4 manual gearbox,
2003 A4 avant TDi
1997 Volvo V40 2.0T
1992 Mazda eunos v spec
1976 Reliant Kitten
1965 Porsche 911