For the price of a replacement battery ($39.95), I ordered a 7.2v, 1800mA external battery pack called the DigiPower DPS-9000. It can attach to the tripod mount under the camera. Plus it has its own tripod mount so you can still use a tripod. Of course, the downside is you will have to remove the battery to change SD cards.
I should be getting the battery pack in a couple of days. I will post feedback about the battery pack after I give it workout next week. I also will be trying out the Trek-Tech.com TrekPod which is a walking stick/monopod/tripod combo.