The two cheaper ones are less mah (power) than the OEM original. The one of the far left (OEM) is the 1500 mah battery the Droid X comes with. 50 bucks for the extended it the best deal. Pick it up at a store on online. It's well worth it. I think it's 1880 mah and it only makes your phone 1mm larger. It's seriously not even noticeable to most. You'll notice it, but no one else will.
I have the ext batt from moto/vzw. Its def a good investment, now for all of you that have the ext batt. Is it just me but after a day or two it doesn't feel as if the batt lasts forever, im sure that it lasts way more than the standard but it just feels that way. Not that it doesn't last forever maybe I got used to the battery life of the extended batt but still expected more than what I got used to with it.
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Last edited by WhoolioPreludee; 10-14-10 at 12:43 AM.
My extended battery lasts between a day and a half to about 2 days. It changes for me because I may use it differently. But I use it a lot at work, but I'm never far from a charger.