Macworld Charging your iPhone on the go is no longer going to be an issue if you have one of these Anker power banks. The Anker 633 Magnetic Battery is down to $40, a 31% discount from the $55 MSRP, while the MagGo Power Bank that also allows users to charge their Apple Watch is available for $65 with Prime, a savings of $15 on its usual $80 MSRP. Now, the first one is a tiny gadget that you can magnetically attach to your iPhone and wirelessly charge your device. Alternatively, you can plug in a USB-C cable and enjoy 20W charging. The coolest part about it is that it also comes with a kicksta…