OK let me counter that.
Spare battery:
Use phone, drain battery.
Replace battery, voila, you're good to go.
Less to carry.
Don't need to use the battery? Don't need to use the battery.
No charging time (its deferred to later)
"danger zone" is not that major of a problem.
If the cover wears out, replacement is cheap, and the cover was probably poorly made.
(here's looking at the story of the man who snapped his 620's back on-and-off repeatedely for extended periods of time, for weeks, IIRC before something broke. the headset jack)
Extended battery options are possible.
No need to plug in on-the-go.
Battery wear isn't as big of a problem.
Date+time changes is a non-issue for a normal device that sets it automatically anyway.
etc
You'll have to juggle batteries when charging though.
Only for your phone model.
etc
External battery:
Start.
- first charge the battery which is in the phone.
- use phone
- decide to charge phone
- take out the large pack and cable from its protective retail box because its super easy for a paperclip to find its way into its USB port these days. (this entire post has some satire, I know a battery short is a potential risk, but I don't have a purse)
- figure out how to plug in cable, risking microUSB damage.
- plug in cable whenever you want, wearing out the port (which I would also say is not a major concern unless you do it 60 times daily)
- figure out how to deal with the pack dangling off the phone.
- cradle the phone so as to not break either the female or male end of the connector.
- not do anything intensive (e.g. GPS, gaming) if the pack isn't fast enough, main battery can reach 0% sooner if that's the case.
- try to go for a run or do other things.
- your mobile device is now not-so-mobile.
etc
I've seen enough people holding a phone and a large pack tethered to it. awkward
You're on the go and have to use your phone, do you keep that thing plugged into the battery?
Of course I own a 920, so I don't have a choice. But I picked up a BB Z10, so its a nice change of pace.
but yea, I technically have both, and they're both have their uses.
But I just saw a really interesting accessory.
http://www.amazon.com/BlackBerry-LS...ag=hawk-future-20&ascsubtag=UUwpUvbUpU3034019
Why not both?