The most important reason is the conversion rate. Battery capacity: 6800mAh. This product is designed as protective backup battery case, which can protect your cell phone well. Storage / transport temperature: -20 ° C ± 50 ° C.
eBay
SYNEOSKYE S1 Case For iPhone 15/16 Pro Max Power Case With 5000mAh Battery Back Cover Stand Phone Case With Magnetic Light
Aliexpress UK
③ Works with wired Apple EarPods or wireless earphone. ④ Allows sync your iPhone to your PC or laptop without removing the case.
eBay
10000mAh Ultra Slim Magnetic Wireless Power Bank PD20W Auxiliary Spare battery For magsafe iphone 16 15 14 13 12 11 pro max F20
Aliexpress UK
For iPhone 11 Pro ,5200mAh,Rated capacity: 3000-3500mAh. For iPhone11 P ro Max ,7000mAh,Rated capacity: 4000-5500mAh. For iPhone11 ,7000mAh,Rated capacity: 4000-5500mAh.
eBay
New-tech NFC Function Phone Case For Iphone 15 14 13 Pro Max DIY Cases E Ink Screen Phone Cover Cartoon Girl Fundas Battery Free
Aliexpress UK
For iPhone 12/13 /14 Pro Max ,7000mAh,Rated capacity:4000-4500mAh. For iPhone 13 Mini ,6000mAh,Rated capacity: 3500-4000mAh How to use For iPhone 12/13/13 Pro,7000mAh, Rated capacity:4000-4500mAh. This product is designed as protective backup battery case, which can protect your cell phone well.
eBay
8X18650 Power Bank Cases Battery Holder Dual USB Type C Charge DIY Shell for iPhone Xiaomi Huawei 18650 Battery Case Storage Box
Aliexpress UK
eBay
10/8*18650 Power Bank Battery Box Holder Portable Dual USB Type C Charge Shell for iPhone Xiaomi Battery Cases Detachable Cases
Aliexpress UK
Smart Battery Powercase For iPhone 11 Pro. White - iPhone 11 Pro Battery Case. increases battery life up to 250%. (5.8 in display).
eBay
8/10*18650 Power Bank Cases Battery Holder Portable Dual USB Type C Charge Shell for iPhone Xiaomi Huawei 18650 Battery Cases
Aliexpress UK
For iPhone 11 Pro ,5200mAh,Rated capacity: 3000-3500mAh. For iPhone11 P ro Max ,7000mAh,Rated capacity: 4000-5500mAh. For iPhone11 ,7000mAh,Rated capacity: 4000-5500mAh.
eBay
NEWDERY 4700mAh Battery Charger Case for iPhone 6/7/8/SE Portable Rechargeable Charging Case Battery Pack Power Bank Cover
Aliexpress UK
The most important reason is the conversion rate. This product is designed as protective backup battery case, which can protect your cell phone well. Why exist this difference?. So the 5,000mAh power bank can really be used by us only about 3000-4000mAh.
eBay
22.5W DIY Battery Charger Case Transparent Fast Charging Case For 6PCS 18650 20000mAh Battery Charging Box For iPhone Samsung
Aliexpress UK