As I mentioned in an earlier post. I have owned all iphones since they came out. I still own every single quality gadget for the iphones, hdmi output, sd card, battery extenders, built-in battery cases, bose/iphone systems (which is were my old iphone4 is), etc.
I used to connect my iphone, too, to the laptop usb during long presentations, since the video cables had a charging extension, but then you cannot use your iphone as a presentation remote, since you are tethered to the laptop..
I personally have 4 batteries for my S2, which is enough for me to last for a couple of days trips. My S2 lasts 6 to 8 hours, or around 4 hours working it very hard. Changing a battery every 6 to 8 hours is not a pain.
It's amazing that people adore slim phones but because of the phones being prone to breaking, they buy huge protective cases that defeat the purpose. On the S2, I don't need a case, it does not break as easily as the iphone, so the battery can be changed easily without weird attachments cases that defeat the phone design.
Don't get me wrong, I like/liked all my iphones 3/3G/3GS/4 but I don't like the iphone 4s because it is a marketing/profit phone that does not add real usability value and does not address the issues that heavy iphone users have.
The phone I need and like is the phone that can do what I need to do, for work, home, etc. For the longest time, the iphone was the closest thing, but now Apple is not addressing issues and enhancing the iphone at the speed that other manufacturers are. Apple seems more concentrated in maximizing profits. Just compare the 3/3G/3GS/4 phones, there have just limited incremental enhancements. Make Apple provide a better usable/advanced phone than it's competitors and I will buy it, but for now, the iphone 4s is not the top phone, usability/practicality wise. I am older, so maybe I am not blinded by bling-bling advertising but more by usability and practicality features.. Maybe the iphone 5 will be the innovative phone, but nobody will know until they release it some time in the future.
One more thing, the iphone 4's lasts only around 2 to 3 hours of heavy use, and the iphone 4s has serious battery draining issues, and if you use the iphone 4s for heavy games, the battery will drain even faster. Those iphone 4 charts doesn't hit reality, and most likely anybody with an iphone 4 will know they are not accurate.
Originally Posted by solipsism
Yes, really! How do you charge the 2nd battery? You have play musical chairs with your batteries. If you have 2 batteries and you use two a day you are then switching them back again to charge them separately which means you have to wait for hours for them to charge. That's a huge pain in the ass.
If you were smart you'd use a phone, like the iPhone, that lasts considerably longer for any heavy data usage.
Or you would buy a great accessory like Mophie Juice Pack or a battery pack that will quick charge through the dock connector. These two can more than double the life of your iPhone's battery without having to take your phone apart. The Juice Pack, which is still smaller overall than most Android phones, can charge both batteries at once (and sync), and the dock connector batteries can be charged at the same time
as your iPhone so you don't have to wake up in the middle of the night to play switch-a-roo with your S2 batteries thus letting you get a good night's sleep before that long plane flight
PS: Pro tip: Use your phone for entertainment on a long trip but plug into your notebook to quickly recharge many, many times over. Also woks with iPad.