If you want a standards-compliant 'fast charge', you need to short the data lines to the device. If you merely cut the data lines, I don't know what the device

If you want a standards-compliant 'fast charge', you need to short the data lines to the device. If you merely cut the data lines, I don't know what the device will do. Probably it will draw 100mA, which is the permissible draw for a USB device that hasn't connected to the host yet, and then it will repeatedly try and fail to connect.