Don't connect the panels in series, this will double the potential charging voltage, although the battery will regulate the voltage to a certain extent, it may at sometime overcharge the battery or fuse the PCB.
I just wouldn't advise doing this.
Connect them in parallel as this will double the charge input current with the correct voltage for the battery & system. Your PCB should handle this as the amperage is so small on these little lights & panels.
Unfortunately these little solar lights don't seem to last long, the batteries get tortured by high temps during the day & frosts during the night.
The PCB components the same & moisture gets them eventually as well.
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