When we all started up on STRAVA many of you bought battery extenders because of how fast the app chewed up the battery.
For those that bought them, which one did you buy and are you still satisfied with your choice?

Duracell PPS2 1150 mA/Hr - 14 months - very pleased

However - I have found that I can get 3.5 - 4.0 hours of usage from my 3GS without the battery extender while running MotionX-GPS. I seldom ride more than 4 hours so the Duracell is not used as much as I thought it would be.

I have used the Duracell and run MotionX-GPS for 6 hours and the 3GS battery is still showing above 50% charged.

I bought Enercell 2400. Got it at Radio Shack and I can run about 8 hours on Strava with it. That way I don't have to close down any of my other locator programs when on Strava. If I had to do it again I might get a bigger one for multi day rides. But they come in about three sizes I believe. Here are some good ones as well. Though the Stichwell got some bad reviews. I have used my enercell for about two months and it works well.

https://www.iphoneness.com/iphone-acc...ery-extenders/

I have used one of these for a long time for my phone as well as other devices that use a USB cable, enough power to fully charge your phone 3 times from dead,
Satechi iCel 5200 mAh will last a full day and well into the night