If i add more batteries to my solar system in 2023 do i qualify for a tax credit?

Yes.

You may claim the residential clean energy credit for improvements to your main home, whether you own or rent it. Your main home is generally where you live most of the time. The credit applies to new or existing homes located in the United States.

You can't claim the credit if you're a landlord or other property owner who doesn't live in the home.

Qualified Expenses

Qualified expenses include the costs of new clean energy property including:

• Solar electric panels
• Solar water heaters
• Wind turbines
• Geothermal heat pumps
• Fuel cells
• Battery storage technology (beginning in 2023)

Use this link for more information:  Residential Energy Credit