Nokia N75

I think you need to double check your research. I have the BL-5BT battery in my phone, and it just so happens to say 800 mAh, just like PhoneArena says, just like this very site says, and just like Nokia's website says. So yes, those who are using a 700 mAh battery, are absolutely using the wrong one. And no, the BL-5BT 800 mAh is the CORRECT battery to use for this phone. After all, that's what it came with out of the box. Let me clarify one more thing. Nokia's accessory website, which you link here, does indeed say that both the BL-5B and BL-5BT are 760 mAh batteries, and when you look at the compatibility part, there is no N75 on the list. It seems that Nokia has made a different BL-5BT battery just for the N75 which happens to be an 800 mAh, which is the correct battery to use for this phone. I totally agree, this stuff is kinda confusing.