Zwift on iPad vs Battery Life

Hello Zwifters,

I’m using an iPad mini and I’d like to try the next Gran zFondo on January 21st. But 2 Pretzel laps will keep me on Zwift for over 6 hours !

Since I need the ANT+ dongle for HR and cadence, I cannot charge as I Zwift…

As of today, I was unable to find an adapter that would allow both charging and the ANT+ dongle…

Any idea ?