I recently got back into geocaching and downloaded the app from their website. Everything works great but the poor 'ol 1300 battery just isn't going to do the job. I ordered an 1800 from HTCExpress just to see what difference I can get out of that battery and still use the factory back and case. I do have a USB and vehicle charger, just looking for a little more juice. I'll report my findings after I get it.
As a last resort I'm going to get the 3500 Seidio Innocell battery.