Rechargable hearing aids

I’m trying to help my mom navigate this world of hearing aids for the first time.

She’s decided on two factors, behind the ear style and a rechargable (on advice of a friend).

Can you guys help me figure out which ones fit that bill and where to buy? We looked at Costco, but the fellow there wasn’t as helpful (or as cheap) as I would have hoped.

She looked at the Siemens and her friend has Sonic.

Your help is greatly appreciated!!