N75 Battery Issue (More Information)
For those who are saying to use the BL-4B battery in the N75 - you are plain wrong. There are many sites out there who are saying it is the correct battery for the N75, but they are wrong. The BL-4B is only rated at 700mAh, while the correct battery is rated at 760mAh. (These are the NOKIA ratings listed for the batteries themselves. Beware, there are incorrect specifications listed everywhere on the net). The BL-4B will fit, and yes it will power the phone - but it has less capacity than the BL-5B.
The BL-5B IS the correct battery for the N75. This gets confusing as Nokia's own web site shows TWO BL-5B batteries (one with the BL-5BT label, the other simply as BL-5B). However, ...
But Nokia needs to fix this situation. Just try to find a BL-5BT battery. Its impossible.
Folks are buying the 700mAh battery because thats what the AT&T folks are selling them as replacement batteries.
I just unlocked and then unbranded my N75 last week. I changed the setting in the Nokia firmware to only use GSM network (I'm not in a 3G area and the phone periodically checks for 3G if you don't change this setting), and my battery life (which already wasn't TOO bad) has now almost doubled!
In fact, with the Nokia firmware, this is almost like an entirely different phone. Stereo bluetooth is enabled now, the menus are easier to navigate, etc.
And to add more interest to this subject, AT&T has the wrong battery listed on its accessories page. They have a 700mAh BL-4B.