Does anybody has any solution to power up a Canon Selphy printer on-the-go? That is; to carry a portable battery good enough to power a Canon Selphy printer so I can take event photos of guests and instantly print and give it out.

Any advice is appreciated.

Or do you know of any place that rents out the Wireless File Transmitter WFT-E4A or E4 IIA (for Canon 5DII)? I have tried Camera Rental Centre but they don't have it for rental.

Thanks in advance...