Anker 322 Maggo Battery (Powercore 5K) - Black

Charge Wirelessly and Attach Magnetically
No more charging cables stuck between your hand and the iPhone while holding horizontally for games or videos
PowerCore Magnetic 5K, 5,000mAh Magnetic Wireless
Super Compact Design
3.7 x 2.5 x 0.59 inches in dimension, just like a credit card.
Multi-scenario use case
Use as a Wireless Charger while charging
Excellent Magnetic Attachment
Strong magnetic force up to 10N, stronger than Original MagSafe