I ordered an extended battery for my Galaxy nexus. It recently came in the mail and I have ran it through it’s tests today. So far it lasted just as long as the stock battery that came with my Galaxy Nexus, but keep in mind that this is only my first charge. Lithium Ion batteries need about 3-5 cycles before they reach their full potential, so I remain hopeful for the time being.
Worse case senario, if it ends up only lasting as long as the stock battery, $5.99 + Free shipping is defiantly nothing to complain about for any replacement battery.
If you are interested in grabbing a this battery for your Galaxy Nexus I9250 (GSM Model) you can find the Ebay Link Here