The Surface Pro 4 Dock does not seem to charge properly when it is completely drained, meaning the charger has not been used for several months. After some searching I needed a regular travel charger which I didn't have. Order this and I now have a travel charger that charges this bad boy and it's quite small and light. The USB connector on it appears to be USB2.0 only, but makes it a good connector for a mouse transponder, and you can use the built-in SP4 USB connector for storage if needed. It's also fairly cheap, about a third the price of a stock OEM charger.
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