Hello, I have a question about product ADP5090. If the solar is not available or doesn't meet the charge load requirement can battery be used to supply to the load? The load being a cell phone battery.

I want to use the ADP5090 for a portable solar charger. I would like to know if the solar is not available or doesn't meet the charging requirement can battery be used to supply to the load? The load being a cell phone battery. Thanks! Truly appreciate it!