If you've ever missed an important call while driving because your battery died at just the wrong time, there is a cell phone accessory made just for you. A cigarette lighter cell phone charger is a cheap cell phone accessory perfect for anyone who spends more than an hour driving per day.
You will never miss a call due to a dead battery on the road every again! Best of all, many car chargers let you talk while the phone is charging. Just put the phone in a dashboard-mounted cell phone holster and use a hands-free Bluetooth headset; you can talk and charge at the same time.
For road safety's sake, don't try to set up the charger and the hands-free unit unless the car is parked. Some state laws consider "distracted driving" to be any use of your cell phone equipment that takes your attention off the road.