tl;dr about 30% charge in 30 minutes, so not as good as DASH (it was never going to be) but a fairly reasonable charger for in your car, which is cheaper and can charge more than just your phone.
https://www.amazon.co.uk/gp/product/B01IR27AGE?tag=hawk-future-21&ascsubtag=UUacUvbUpU5356333
Jono
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