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Those li ion car jump starter packs. https://drivinglife.net/best-lithium-ion-jump-starter/
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I looked at them ages ago and they all seemed to be hundreds of pounds. Now some are like £40.
Will the cheap ones actually start a car?
ie. https://www.amazon.co.uk/Suaoki-Starter-Current-15000mAh-Flashlight-P6-Jump/dp/B074RDHM55/
"it is rated as 800A peak current and it started my IS250 (which has a 2.5 litre V6)"
Mine is only a 2L petrol.
I have lots of them. Don't think the car has USB though.