Hi @Reuben, I did not see your reply to my 2 clarification questions below. In any case, the following observation is making me nervous about inserting Dash/DashPro onto the solar shield with charging board: The DC power or solar panel power is fed to the input adapter of the charging circuit board, the voltage also appears on R01 (VBATT) pin and not the L01(USB_5V) pin. From all the messages above, I thought the power is going to the L01 pin!
So if I leave the jumper in non-battery mode, isn't it going to cause a problem if Dash/DashPro is inserted on the solar shield?
Also, the specs says that the VBATT pin in battery mode is from 2.2V to 4.4V. This must be when using the battery charging circuit inside the Dash/DashPro in battery mode. When an external charging board is used, and 5V or more appear on this bin even if no battery is on the Dash board, any bad things will happen. Because of this uncertainty, I still dare not plug in Dash/DashPro onto the solar shield with action external charging board.