How do I hook up a 1.5v solar outdoor diode light without the solar panel to a 12v battery bank in a motorhome?

Another post from Solar Christmas Lights.

I have a cheap four color diode from a rechargeable solar outdoor light that I want to install inside my motorhome and run it off my 12v battery bank but I need to know how to reduce the power so that it will not burn out the diode.
It works fine without the solar cell except that it wears out the 1.5 AA batteries that it uses.
I am sure that it would take forever to run down the six 6v golf cart batteries that I use for power in my RV, especially since they get recharged every time I run the RV.
Any answers out there?
How do I do that?

Are you sure you wouldn’t rather just use a NiMH battery charger that plugs into your cigarette lighter, and put the AA battery into your LED light?

It’s certainly possible to put a dropping resistor between the 12V battery and your 1.5V light to make it work, but it would be a bit of work if you don’t already know what you’re doing. If you have an electrical engineer friend, they can get a DVM to measure the current drawn by your light, then help you go shopping for the right value resistor at (say) Radio Shack.

Solar Christmas Lights might save you a considerable amount of money on your powerelectric bill during a time of the year when money can be in short supply.