I've tried a few and you have to take most sellers blurb with a pinch of salt. doh

I'm sure some of these units will start a 900cc Corsa but the bigger stuff soon defeats them.

Cain/Wolf Performance do a very good product - if a tad pricey -

https://www.wolfperformance.co.uk/jump-starts---pps.html

I ended up with this one via Amazon (it has since been reduced in price smile ) -

https://www.amazon.co.uk/gp/product/B01CFJO88S/ref=oh_aui_search_detailpage?ie=UTF8&psc=1

- and it works well, starting the 4.4, Aero8 easily.

James

Aero8 , Series 1 - Boston Green
RR Evoque P300E Autobiography
Smart Brabus Convertible
Monkey Z125