I am about to start construction of a new house, and unfortunately the property is not near where I live. I wanted to keep an eye on the construction site (No electricity) to make sure workers are showing up. To do so I want to put a cellular phone in a bird house, which will transmit a video from the camera over the cellular signal. (The Android/iPhone app is called "Alfred") My only problem is, how do I keep my cellular phone powered for 7 to 14 days without charging?
I would GREATLY appreciate any help anyone can give. I think the best option would be to connect a 6 or 12 volt motorcycle or car battery to the phone, but what do I need to consider other than converting the voltage from 6V or 12V to 3.7V? How do I convert from 12V to 3.7V? The screen on the phone will be off the whole time. All I will be running is the camera, and data transmition.
Does it make a difference if I connect the external battery directly to the phone so the phone thinks it is the internal battery versus connecting the external (6 or 12v) battery to the phone via its USB connector which the phone would think is a charger?
Solar won't work because of tree coverage. My other thought was breaking open laptop batteries and using the cells. I would like the least expensive and a simple way of doing it. Can I just connect a cigarette lighter USB plug to a car battery directly and plug the phone into the USB?
Thank you in advance for any help anyone can give.