Be careful of the stuff on Aliexpress. I've bought three different powercells for use to drive USB lights when camping and they don't have the capacity claimed.
Buy a powerall Element. I have one and I have tried it on my quad and my 4.0L V6 Prado. Started the prado in place of the main battery fine. For my old diesel surf, I bought the biggest jump starter that Supercheap had in the sale. Works fine but heavy.
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