I posted a thread similiar to this and never really got anywhere, Dunno where the ended up lol. If I ever get my data issues straightened out I'm going to give one a shot for the $5-$15 its well worth a try! I'm thinking it will NOT work with our phones though, as it seems moto has some trickery up their sleeves on the battery interface, someone had said even with VZW's extended battery they got an "Insert motorola battery" error. but if you could get a WORKING 4000mah battery *drool*.. Full day maybe 2 on charge! LOL
I do disagree with the cheap batteries statement though, these types of batteries aren't that expensive anymore, what gets expensive is when the battery has to have extra features to interface with the phone. I've bought $4 batteries for my grandparents-in-law and they haven't had any trouble out of theirs. granted that's a feature phone battery