From my understanding the last time I looked into this the way it works is that the printed model inherits the license. That means you can’t sell cc-noncommercial models directly, but if someone contracts a print shop and provides the model they can still pay someone to make it due to paying for a service and not that product.

Though print shops seem to flagrantly violate this anyway without much issue.

My braun has a replaceable battery, it’s a li-ion 14500 (AA size but 3.7V), they’re a couple bucks.