OK... I'm kinda new hear and i don't pretend to be some battery expert but i saw someone said that once falexs conditions the battery it will begin to last longer and i have seen on this forum, more than a few times, that the battery for the Eris does not need to be conditioned because they have almost no memory effect. Also, that it can be detrimental to battery life if lithium ion batteries are ever fully discharged. in fact the only reason one would discharge the battery would be to calibrate the digital fuel gauge in the phone. this needs to be done roughly every 30 charges (so about once a month). if it is not done periodically then the gauge will become increasingly less accurate.
For the first full drain, it is helpful to go from 100% to close to 0% (some will say to let it die completely. I have never done this).
Some say to do this 2 or 3 times. Once may suffice though. I don't know that this actually DOES anything to the battery itself (in terms of "conditioning") though. It is typically to allow the phone to calibrate how it sees the battery, or in some sense 'learn' what the battery does when it is full and when it is close to empty (in terms of how much voltage it puts out before it stops putting out any real wattage). When the wattage (or amps, depending if you're including volts in the calculation, it doesn't matter though) starts to drop to the point of the phone not working, it will warn you that the battery is at 20, 15, or 5%. In the future, it helps the phone to know how many volts the battery is putting out when it starts to stop putting out watts/amps. Part of the point is that, it becomes more accurate.
So if the phone says it's at 50%, it's really at 50%. The first time you are discharging the battery, the phone doesn't really 'know' what 50% is, unless it is pre-calibrated.
These phones may actually be pre-calibrated for our 1300mah battery. I have no idea. I've been following everyone's advice when draining/recharging.
IN GENERAL, Li-Ion batteries do better when you, by and large, drain them to 20% or below, and charge them to 80% or above (so they say!).
To this minute, my phone charges great, but takes an extra 30 minutes to do charge the last % or two, to 100%. I think the phone has to realize that the battery isn't going to get any more charge before it says it's 'charged' (the green light)