In a nutshell, I have purchased the OEM 2100mah Samsung Battery and now I am currently using a Hyperion Electronics 3800mah Extended Battery in my Galaxy Nexus. Even with the 3800, i can max out at about 19 hours with moderate to light use. I am looking to purchase a battery that will allow me to have heavy use all day and not have to worry about finding a charger as soon as i walk in the door when I get home. Any suggestion? Is my poor battery life currently because my battery is generic? Help is appreciated! Thanks everyone