The cable for the original Voice Remote Pro (VRP) is just a micro-USB cable; there's nothing special about it. Likewise, the cable for the VRP v2 is just a USB-C cable. If you've tried multiple cables and your remote won't charge, it's not likely to be the cable that's your problem.
If you're referring to the cable for the stick itself, you need one of these:
https://www.roku.com/products/accessories/usb-power-cable-with-long-range-wifi-receiver-streaming-st...
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