They usually put out more like 14 volts in direct sunlight for proper battery charging, but yes, you can connect with battery clips - but it's a good idea to verify the panel includes a blocking diode to prevent panel damage in case the battery connections are reversed accidentally. IF the panel puts out current much over 2 amps or so, there's also the possibility of battery overcharging if left unattended or monitored for extended periods...
John Day....|'88 Winnebago Super Chief 27ft. Class A
Eastern .....|'88 KIT model 240 24 ft. 5er
Oregon ......|'02 Dodge/Cummins 2500 Quad Cab