Mac safe battery not working

I'm assuming you meant MagSafe battery (not Mac safe). Have you tried using it without a case on your iPhone? Have you read this article -> How to use your MagSafe Battery Pack - Apple Support

Cardenales Said:

"Mac safe battery not working: i connect my Mac safe battery to my iPhone 12 Pro Max and is not charging my phone what can be?"

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Troubleshooting Mac Charge:

Refer to the following....

A. Reset the SMC and your NVRAM:

(Applies to Intel-Based Macs Only): Sometimes when changes are made to the system(i.e. Updates), system configurations (i.e. for Power) become manipulated, technically. So, reset the SMC and NVRAM. Try performing each thrice. It may take sometime, being certain you have the time to perform these resets.

B. Try a New Charger:

• Power & Cables - Mac Accessories - Apple - Select "Mac Compatibility" on the left
• Find the Right Power Adapter and Cable for your Mac Notebook - Apple Support

C. A Few Links to Refer to for Power:

• If your Mac doesn't Turn On - Apple Support

• About Mac Notebook Batteries - Apple Support

• How to Turn your Mac On or Off - Apple Support

• If your Mac Battery won't Charge - Apple Support

• Charge the MacBook Pro Battery - Apple Support