magsafe wallet and MagSafe battery at sane time

yeah I don’t think that can work, if you have both of the products to try it on then try it. However to use MagSafe the items require magnets to connect with each other. The back of the MagSafe battery does not have any magnets for the wallet to connect to which will make it not work unfortunately.

The battery requires direct contact with the phone so it is not possible to use both devices at the same time.

Unfortunately not, you can only use one MagSafe accessory at a time with your iPhone. So if you want to use the wallet and also the battery, you will need to switch between the two.

What do you base this statement on?

It is possible to connect a MagSafe case, then a MagSafe wallet, so clearly you're wrong.

The unanswered question is whether one can connect a MagSafe wallet to the MagSafe battery. I suspect the answer is yes, but Apple's documentation is not clear on that.

why would you want to connect your MagSafe wallet with your MagSafe battery?