Providing your camera has a 12 volt external port, you can use a 12 volt motorcycle battery, one from a ride on lawnmower, golf cart etc. The center pin on the plug is positive. These plugs can be used from an old electrics game (attari etc). Just just off the transformer. Usually the positive wire will have a white tracer line, or dotted line or grey tracer line on it. Check for continuity with a digital meter. I usually mark the positive wire with a white tape with a "+" on it for quick identification at the end you want to connnect to the battery. Do not reverse the wires or you will fry a component in the camera. The camera may still work but not the external port. An electronics shop may also carry this plug. They come in: straight, right angle and multi tee style. When I had my Wild View Ez Cam (the early style) I wired all 10 of my cameras that way. Those Wild View were hard on batteries. One can also operate the camera in much colder and longer conditions. However, once the battery drops to around 5.5 to 6 volt range, this is too low a volt to operate the camera properly. In cold weather, bring the battery in and warm it up to room temperature before recharging. A cold battery will not recharge as quickly as a warm one and with a cold battery, there is a chance it could explode when recharging. A handy piece of equipment is a digital multimeter for checking batteries in the field or else where.