Also, since the chemistry of the present Lithium batteries results in a non-linear charge/discharge curve, this ads to tree error rate and these cumulative errors throw of the meter and cause it to indicate incorrect values. All meter hacks do is take the single digit days that the phone attempts to average out by showing only 10% changes and instead show the more volatile 1% value changes resulting in reading changes that can appear to run contrary to actual use, such as large discharge during periods of rest our little movement during heavy use. This error rate is worst during the middle of the discharge curve when the voltages remain relatively flat compared to the step drops between 100% & 90%, and between 20% and 0%.
See the image below for some examples.
The first image shows over a 12 hour period of moderate use the voltages between about 70% and 10% indicated charge levels fluctuated wildly and even increased at times while power was being consumed even though no charge was applied. The second image shows that even over the longer timeframe of 24 hours and with virtually no phone use at all (phone remained idle), and over a tighter range of charge level percentages between about 75% & 40% the voltages still didn't follow the discharge curve being represented in percentage of remaining power, and again there were periods where voltages run opposite of or at rates of depletion less than that of the charge level indication.
Voltage isn't the only data used to estimate relative charge level but the result can be anywhere from fairly close to even dozens of percentage points away from actual State of Charge. This misinformation supplied by the phone has resulted in countless owners being left with a phone that won't wake or take a charge, even after just a short time prior having indicated charge levels of 30%, 40%, even 70% on done cases. This gets worse over time with repeated partial or full charge and discharge cycles while power is on. This is why it's important to train the meter approximately every 40 complete 100% charge/discharge cycles.
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Last edited by FoxKat; 08-26-2012 at 09:34 AM.
"Saving DROID Razr's, one battery at a time. :-)" - (credit SallyC)
Avatar is Maxwell Smart, AKA Agent 86, from "Get Smart" (with his signature "Shoe Phone"), a SitCom TV series by Mel Brooks & Buck Henry, based on the spy thriller series, "The Man From U.N.C.L.E.".
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Wow, cool beans! That was fast. Thanks for making the status bar icon bigger and thanks for adding time since last charge. Very cool indeed!
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If you notice any wokiness with the widget (not responding to touches, etc.) try removing it and adding it back...I think an update may have weirded it out until you remove it from the homescreen and add another one.
Just an update to tell y'all I've fixed a bug that caused the widget to stop responding to clicks after a while.
Let me know if there are more features you'd like! Or if you have advice on how to get this out to more people! I have 32 active installs right now! which is spectacular, but I'd really like to see that number grow. I realize it's an app with a limited market (Motorola phones, probably in the US), but if there's anything you all could suggest, that'd be great!
This is a pretty awesome app. I like how simple as well as informative it is one thing I would like to see is average battery life like is on gsam.
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