Get the USB charger with multiple ports from Amazon.
https://www.amazon.com.au/Charger-Ci..._rpt_ba_s_54_t
I’ve this one in Tiguan and it works great, the inbuilt voltmeter keeps an eye on the battery and since it’s always connected even when the g option is OFF it’ll show 0.62V flashing, telling me that the canbus in the car is ok.
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