With my 4-year warranty battery now 5 years old, and a trip to the Isle of Man looming, I looked into these micro-boost packs. I eventually bought a Ring RPPL200 - https://www.ringautomotive.com/en/product/RPPL200 - mainly with the mindset 'if I have one, I won't need it'. Well, I haven't needed it for my car - yet! But I did use it today on my neighbour's 1953 Jaguar XK120 who was at the same car show with a flat battery. The 'blurb' says it will start a petrol engine up to 3l, up to 6 times. I am pleased to report that it successfully started the 3.4l XK engine 4 times and, after plugging it into the USB socket in my Stag, was fully charged again in the 20 minutes it took to drive home, following the XK.
If you are considering a micro pack, this will fit the bill.
 
							
						
					If you are considering a micro pack, this will fit the bill.
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