Disclaimer: I am not responsible if you break your phone.
Pro
1. used for emergency because battery can be replace easily
2. Original battery has 700 milliamp (mA) the AAA battery has 800 milliamp (mA)
Con
1. Can not charge using the standard charger that came with the phone. (somebody tell me why is that place or any help would be welcome )
2. It looks ugly and bulky.
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Signing UpStep 1Parts
1. soldering iron
2. small thin wire
3. 3 AAA batteries
4. Nokia phone or any other spare phone
5. AAA battery holder
6. Drill to drill hole in the battery door.
7. Wire stripper or use your teeth
8. Tor Screw Driver (I am not sure what the actual name is )
9. Double side tape.
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Basically, it's because the Battery charger IC in the phone expects a proper Li-ion cell to be found. These cells have circuitry not found in your AA battery pack. So, when you go to charge it, the charger IC says "battery's malfunctioned, do nothing". On the other hand, while the batteries are between 3 and 3.6 volt, the phone will OPERATE, because the phone's circuitry sees a proper voltage.
As for the design, yes, it's no iPhone. But the batteries don't make it better ;).