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12v 1.8w solar panel to charge AA 1.2v NiMh batteries

would i be able to use a 12v 1.8w solar panel to charge AA NiMh batteries? i built one of the mr16 halogen bike lights with the instructable found here and now have 10 AA NiMh batteries that i would like to charge, and i only have a 4 battery wall charger. A 12v 1.8w solar panel is on sale for $15. its specs are: # Includes quick-connect hardware: connecting wire, DC clips, 12 V socket plug and barrel plug, mounting hardware/accessories # Built-in reverse current protection; won't deplete the power-supply system so can i use this to charge AA batteries? if so how many, 2,4,6,8,10?. i would want to keep it simple so i would just wire my battery holders to the panel if possible.