In case your battery goes flat
Keeping it simple and avoiding all that 'push-puff-'n stuff' 
Fit a positive terminal accessible point
Use a small power bank weighing in at....300 grms!
Connect terminals-turn ignition key- and fire up engine - easy peasy
Why struggle! making technology work for you- it fired up my F650 13 times and used only 25% of its stored charge.
Once you're on your way again, plug in 12 volt charger to re-charge power bank- Sorted-
( btw-it can also charge up phones, tablets, water filters, computers, rechargeable torch batteries etc. via its USB outlet and it even has a torch built in. Free virtual fruit basket to whomsoever knows this product!)
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