Well one solution is to carry a Powerbank with you, or recharge it in the car, but that often is not convenient or suitable.
Recently I ordered a case for my Apple iPhone 4S that also contains a 2,200mAh rechargeable battery with enough power to more than double the iPhone's basic capacity, and it was only $14 postage free in Australia. Yesterday I received it and tested it out and it works great!
It's called the iPower battery case and the iPhone just slips into it, and you can keep using your phone while it recharges. That's handy stuff, and I like it and fully recommend it.
You can buy it from eBay at this link: http://www.ebay.com.au/itm/290676630834?ssPageName=STRK:MEWNX:IT&_trksid=p3984.m1439.l2649#ht_3185wt_1271
Here's a picture of the iPower device if you want one, and I consider it a must-have accessory for the busy business person who doesn't have access to recharging during a busy day!
