Solar Panel output

Just got my hands on a folding 160w (monocrystaline) with a solar controller attached to the back of panel.
The question being :
When I connect a multimeter to the controller output leads while producing power from the sun, the meter reads 20v, so is this an ok level to connect it to the batteries that I have (2x 100ah) or do I need to buy a better quality controller
Need some help with this, don't want to damage the batteries as the're not very old
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