Standard Qi wireless charging can lose as much as 50% of the portable battery’s power, but MagSafe and Qi2 wireless charging loses ‘just’ 30%. Read on or go straight to the best magnetic power banks we have tested, listed by power, portability and functionality:Best size magnetic power bank for youYou should consider size when it comes to a power bank: physical size and battery capacity. Wireless power bank charging speedIf a power bank is rated as MagSafe Certified it will wirelessly charge at up to 15W. We run the iPhone’s battery down, recharge using the power bank, and keep doing this until the power bank is empty. Best iPhone battery caseWhile not a wireless or magnetic solution, a battery case is a power bank built into a protective case for your iPhone.