If you're going to improvise something like this using bare wires get to know your hardware. Can your phone handle 6v? Is 4.8V enough? I'd rather have a phone with a dead battery than a battery with a dead phone.
Also don't forget that some phones require more complex hookups than just connecting the red and black wires. Motorola phones for example (new ones) use a USB plug but you have to short out certain pins inside the connector or the phone will ignore the power you're feeding it.
Couldn't agree with you more. But the easiest solution is to either carry a spare cell phone battery around with you or one of the commercially made AA adapters or just get into the habit of charging your phone every night. Chances are in an emergency your not going to know which pins on the phone to touch with the wires without knowing your hardware unless you've have a pin diagram drawn on a piece of paper inside the battery compartment of the phone
To get an idea of the voltage the phone requires, it will say on the phone charger supplied with the phone.
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