Can 2 9-volt batteries in parallel be recharged from a 12 volt solar panel?

can 2 9-volt in parallel be recharged from a 12 volt solar panel, or would they only charge up to 6-volts each?
I know they can not be charge in series, the 12-volt is to much for the 9-volt, so they have to be in parallel. but will a 9-volt recharch to 9-volts if the input [...]

How much of a solar panel does it take to charge a 9volt battery?

How much of a solar panel does it take to charge a 9volt battery?
A double AA battery etc….