Impressive amount of data presented.
Only question I have is, why are you doing nearly full cycle deep discharges and allowing the battery to stay on the charger past full saturation when you specifically recommend that users should only charge between 25 to 75% to maintain battery health? Source -
http://www.droidforums.net/forum/sm...ion/198191-white-light-death.html#post2117585
Or are you planning to follow your own advice next and show what happens with the same graphs over another 4 day period?
Good questions...
First off, I am not concerned for my own battery's longevity at the moment (and really not at all). I fully expect it will meet or exceed my need for longevity.
This extended charge and usage cycling didn't start as an experiment, but out of necessity since having both my wife and father-in-law enter the hospital on the same weekend (Labor Day Weekend), and both requiring emergency surgeries (wife with complications to cancer and previous surgery, father-in-law with a broken hip). This unique and completely unexpected situation had me instantly thrust into the combined role of Mr. Mom, housekeeper, & (already) breadwinner, while also being a supporting husband, father, son-in-law and caregiver. The strain of my son's school bus schedule, my work commute, stress of the surgeries, recoveries, long hours in the waiting room, and then trips back and forth to the hospital kept me out and running around non-stop from wake to very late sleep each day. In the initial 36 hour period I didn't sleep at all, and wasn't even "sleep" tired.
During those days, I had been using it very heavily and came to respect the battery and system even more. Now that my wife is back home and amazingly well recovered after her extensive surgery and a week as an admitted patient, I have resumed a somewhat more normal schedule though it has been still more running around than usual, though my father-in-law (who busted his hip) will likely be an inpatient for therapy for several weeks still. So, it was during this more recent period, since my wife's release from the hospital, a less stressful period of time that I decided to turn necessity into an experiment.
I was simply looking to see if I could get a good picture of what the battery was really capable of from a full saturation charge to the bottom of the safe discharge limits, since there are many who complain that even the MAXX battery isn't meeting their expectations. This was an experiment to test the boundaries. In order to get the results charted, I had to disconnect the charger cable on my car Navigation Dock so I wouldn't interrupt the discharge cycle with a charge cycle and thereby prevent getting a true reading of capacity and duration of discharge. Yes, as in any experiment where you push the envelope into uncharted territory it may do ever so slight damage to my battery's long-term health, though miniscule relatively speaking considering how few times I would have done such 85% discharge cycles, but I know that going in and will not be blaming anyone if the battery doesn't continue to provide me with what I feel is a fair day's use at some point in the coming year or two.
As for second comment it's actually a very good idea. I hadn't thought of doing such a system run and charting it because there would be miniscule if any way to evidence the benefits long-term to such charge/discharge patterns unless I did so over a reasonably long sample period and number of cycles. Extending out the data could point to a trend by looking at the relative reduction in the total capacity for the sample period. However the length of time and cycles that sample would have to run is likely longer than I wish to devote to such an experiment, but it's still a good idea.
So to summarize, what I do personally with my phone is both my choice and doesn't have to be representative of the recommendations I put forth for others who are looking to achieve something that I am not concerned with - extending the life of my battery. Others may be concerned simply because it's designed not to be "user-serviceable", but I've had these phones open before, have removed motherboards, and have replaced digitizers, displays and cameras, and know that if I needed to replace my battery I could do so successfully and with little risk...but also that if I screwed it up I wouldn't then place a false warranty claim in order to get the phone replaced at the expense of the company.
The experiment is done. I've closed the books on it today, however my pattern of usage and charge will be unique to me, and since I choose to plug in at bed, I will be charging to full saturation every night (and yes, decreasing the long-term performance of my battery in doing so), and will also be performing interim charges as I commute to work, to the store, to the hospital to visit my father-in-law (who turned 94 today), and to wherever else my days may take me since my phone resides in the Navigation Dock from the moment I sit down in the pilot's seat until I am preparing to disembark. As well, it may be partially charged at times during the day while at the office or home if I am doing direct USB transfers although that is a process that I do few and far between with the intervention of wireless data transfers.
Today, I unplugged at 11:09am, and it's now 1:52am, almost 15 hours, and my phone is showing 70% remaining. I have concluded that the battery in the MAXX, when charged to 100% capacity (full saturation charge), and used light to moderately during the day, can easily provide 2 days of such moderate use (or about 36 hours - daylight hours with an overnight in between), without an interim charge, and also can easily supply sufficient power for a hard day's work on the same charge. For me, it's going to be difficult to get into the "zone" of 25% to 75% and stay there, but I'll be giving it a whirl over the coming weeks.
These past couple weeks were a dramatically unique period in my family's life, one I hope to never even come close to repeating, but fortunately it appears that we are all on the road to a collective recovery (though dad has a hard road ahead of him).