will this work with iphone 14 pro max?

No. You could find the battery case for iPhone 14 Pro Max by going to the link as follows. https://www.amazon.co.uk/dp/B0BJDV2V6C?ref=myi_title_dp

Will this case fit my iPhone 12

No, this battery case is exclusively designed for iPhone 12 Pro Max and iPhone 13 Pro Max. It's NOT compatible with iPhone 12 mini, iPhone 12, iPhone 12 Pro, iPhone 13 mini, iPhone 13 or iPhone 13 Pro. You could find the iPhone 12 battery case by going to the link as follows. https://www.amazon.co.uk/BAHOND-Rechargeable-Extended-Charging-Headphones-Black/dp/B09N3HBCKD/ref=sr_1_9?crid=2M42F3VPYJT8K&keywords=iphone+12+battery+case&qid=1654939839&s=electronics&sprefix=iphone+12+battery+c%2Celectronics%2C502&sr=1-9

SITONG iPhone 12 Pro Max / 13 Pro Max Battery Case

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