Will it attach with a silicone cover on the phone?

Hello celticcol,

Thanks for choosing the Apple Support Communities. If we understand correctly, you want to know if the MagSafe Battery Pack will connect through an Apple silicon case. We can understand why you'd reach out for a solution.

We see you've came from a really helpful article. Here is some info you may have overlooked.

• "MagSafe Battery Pack was designed to attach directly to your iPhone or through a case with MagSafe. If you use any other case that holds items like credit cards, remove them before charging with your MagSafe Battery Pack."

If would appear the case would need to be a MagSafe case. Check out this link for cases with MagSafe.

MagSafe - All Accessories

Cheers!