If you have a way to hook up an external power supply, a cheap rechargeable 12 volt battery comes in a rechargeable spotlight from your local Wal-Mart. For $20 or so you can get the spotlight and then take it apart to get at the battery. The charger wire that comes with the spotlight fit perfectly into my trail cam, so I just cut it off and wired it directly to the battery and then hooked it up to the camera. Another cheap, but useful tool, is a 2 Amp charger from Wal-Mart. When the battery runs down, hook it up and give it a good charge.