How do I initially charge the batteries in the mophie?

It it under warranty. Register it, take it back and insist, even though they say Mophie will replace it, I don't think they can do that. Or you can just start a warranty claim online

Does this come with a warranty? - Q&A

Best Buy https://www.bestbuy.com > site > questions > question
Aug 14, 2018 - Mophie products come with a 2 year warranty from date of purchase. Although, if you have a problem with your juice pack, you will need to send ...

Do mophie Chargers have a warranty?
We make it simple and easy for you to make a warranty claim. Please select the button below to start your online warranty claim. You will be asked to log in or set up a new account to get started.

Replace My mophie Product Under Warranty

Zagg https://support.zagg.com > en-us > articles > 2148101...
Click on your registered product for which you want to process a replacement. Then select Product Options and click on Warranty Replacement. mceclip0.png.

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  mophie - Welcome to ZAGG Care

  https://support.zagg.com > en-us > 201797698-mophie
  We make it simple and easy for you to make a warranty claim. Please select the button below to start your online warranty claim. You will be asked to log in ...
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  Register My mophie Product

  https://support.zagg.com > en-us > articles > 2141855...
  Please note: As items may ship from multiple locations and also because each warranty applies to a singular item, only one item can be replaced per warranty ...
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  powerstation®

  https://www.zagg.com > cs_eu > download > link
  PDF
  Except for the limited warranty expressly set forth or to the extent restricted or prohibited by applicable law, mophie expressly disclaims any and all other ...

check the website.

this should just work. It will just take a long time to charge, since the car charger probably only delivers 5V 1 amp. This can take more than 24 hours with such a big battery bank. Also make sure that the car is turned on, otherwise it will not charge.

Check another charger and battery if not solve issue then its mobile phone charging IC can be faulty which is built on PCB Circuit.

its probly solderd in place

Use a paperclip to short the two terminals in the usb output Jack. The two at the opposite sides of the jack. I have to do it before almost every charge.

Will your droid 4 charge with other non-Motorola chargers?

Mark
Motorola Support

Use the cable that came with mophie not some third party usb cable simple....

If it's flashing all lights fast at same time....don't worry. My mophie juicepack powestation does this all the time and refuses to take any charge. I bend a paperclip into a u shape and short the pins in the usb output Jack for not even a second. Quick touch is all that is needed. NO LONGER OR RISK DAMAGE OR FIRE. Resets the chip inside. Charges fine then.

The Mophie has no influence and can't influence the actual content on your iPhone, there is another reason, please indicate anything strange/out of the usual you did previously.