Introduction: Make a Solar Battery Charger in 5min
Use a garden lamp to charge batteries. This lamp cost $4.00. I used it to charge the batteries for my beard trimmer.
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Take out the three screws holding the unit together.
Insert the battery you wish to charge. Mine was an AAA, so I had to strech the spring and pop the positive connector out and reposition it.
Then just put it back together and place it in the sun for a day or two. You'll have to take the battery out before it gets dark or it will light up and use power. I suppose you could cut the wires to the diode if all you need it for is charging.