Keeping My Phone Charged

I can always tell when my teens have used my cell phone--my battery life is not so good, and they seem to be running my battery down a lot lately. I used to only charge my old phone every week or so--now, I seem to need to charge my new phone every couple of days. Maybe it is because my teens use my phone--but I also think that the battery life is shorter because my new phone has more features. my old phone didn't even have a camera--my new one does, and it seems to use the battery life very quickly. My teens love to use my phone to take pictures--they download them to the computer and then upload them to their Myspace pages. I told them not to send photos in text messages because that adds up quickly--I get charged per message and it costs more to send a picture. Anyway--we have to charge my phone at least every other day now. Maybe it is the phone--maybe it is the camera that uses so much battery life--or maybe my teens are using it a lot and that is running the battery down faster. Either way, as long as it gets charged and I am not left with a dead battery, I guess I'm ok with it. That has only happened once--I have to remind them often to keep it charged--so far, so good! :)