Well, I've got another day under my belt with both the phone and this device, and have some additional thoughts:
- The battery on my iPhone 3G seems to last a bit longer each day, and was noticeably better today. Maybe it needs some "breaking in" through a few days of use, or something like that. I am assuming it will level out soon since it can't continue to get better forever, can it?
- I decided to try recharging my phone with the Kensington battery extender today, and I find that it will charge the phone very quickly - much quicker than I'd expected. In less than an hour, it brought my phone from approximately 25% charged to fully charged.
I still haven't fully tested its effect on talk time (i.e. live use of the Kensington battery as a power source while talking vs. just as a charger when I'm not using the phone) but I'm still quite pleased with this device as a way to keep the juice flowing in my iPhone 3G.