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
JCID V1SE Battery Repair Flex Cable FPC Battery Externel Tag Flex for iPhone 11 12 13 14 15 Battery Health Information Modify
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
5Pcs/Lot Phone Battery for IPhone 5S SE/2/3 6 6s 6p 6sp 7 7p 8 Plus X Xr Xs Max 11 12 Mini 13 Pro 14 15 Plus Battery For Apple
Aliexpress UK
UNKLOU iPhone 11 Battery Case provides a hassle-free charging solution on the go. Never worry that your iPhone 11 will run out of battery. Designed for iPhone 11, Make your iphone special style. High class material to protect your iPhone 11 Charging and protection 2 in 1.
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MECHANIC Power Pro Ultra Data Boot Cable for Iphone 6-X 11 12 13 14 15 Pro Max Battery-free Testing Detection Power-on Line
Aliexpress UK
Battery capacity: 6800mAh. Storage/transport temperature: -20 ° C ± 50 ° C.
eBay
PHONEFIX NO Need Programmer 2.0 Battery Tag-on Flex Cable for iPhone 11-15PM Fixed Unable to Verify this Battery Error Message
Aliexpress UK
The most important reason is the conversion rate. Battery capacity: 6800mAh, the Rated capacity is 3900-4200mAh. Working temperature: 0-45 temperature degree. So the 5,000mAh power bank can really be used by us only about 3000-4000mAh.
eBay
i2C Battery Repair Flex Cable Tag-on FPC For iPhone 11-15 Pro Max Deletes "Important Battery Messages" Renovates Battery Health
Aliexpress UK
5000mAh for iPhone XR. LONGER BATTERY LIFE - Gets 100% extra battery life for your iPhone. COMPACT CASE DESIGN – This is the most compact battery case for iPhone 6/6s/7/8/plus/X/Xs/XR/11,12 /11,12Pro/ 11,12 Pro Max/ 12 Mini, Even with its distinctly thin and lightweight design, it still provides superior protection.
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5pcs/lot Vormir Rechargeable Battery Cell No Flex for iPhone 11 Battery Without Message 12 13 14 15 Ori Replacement Repair Parts
Aliexpress UK
6000mAh For iPhone 11/11 Pro Max. 6000mAh For iPhone XR/XS MAX. 6000mAh For iPhone 12 Pro Max. 6000mAh For iPhone 13 Pro Max. This product is designed as protective backup battery case, which can protect your cell phone well.
eBay
Big Hole Back Glass Cover Replacement Part For iPhone 11 Pro 5.8 inch Rear Battery Housing Door With Back Glue A2160,A2217,A2215
Aliexpress UK
The most important reason is the conversion rate. Battery capacity: 6800mAh, the Rated capacity is 3900-4200mAh. This product is designed as protective backup battery case, which can protect your cell phone well.
eBay
10Pcs High Quality Battery Adhesive Sticker For iPhone 15ProMax 14 13 12 11 X XR XS Max Double Tape Glue Part For Phone Battery
Aliexpress UK