This falling out of sync happens over time and with repeated partial charging cycles that may not often reach both the "low battery" and "full" - or 100% charge levels. The common cause of batteries deep-discharging is typically as a result of the metering and charging system becoming out of sync with the actual State of Charge (SOC), of the battery and to its minimum "empty" and maximum "full" capacity levels.
See How to Awaken Sleeping Li-ion - Battery University I certainly wouldn't risk a thermal runaway by trying repeatedly to force-charge it. Fully charged should read about 4.0V to 4.2V With yours floating at 2.75V "Fully charged", I'd call it a lost cause and replace the battery. The open circuit voltage is not supposed to fall below a nominal 3.0V under normal use, and these batteries are designed to go into "protection mode" (to prevent potential internal shunts being formed causing internal short circuiting - a potentially dangerous condition), when the voltage dips below about 2.9V to 2.2V. I read your OP and there is clearly a problem with the battery's voltage level. So sorry I am just seeing this thread right now. I'm willing to try anything at this point!Īdditional information: I put my multi-meter on the battery and it's charged to 2.75 volts. I won't be out anything if it's toast, but if I could get it powered up again, at least I could get my info off it so I can sell it for parts or something!!Īny help is appreciated. The phone said it was charged, how can I force it to start? Heck, I even popped the back off and tried to "jump start" it with a spare USB cable I had! By the way, I'd done that before, when it first quit working, and it seemed to help then. By the way, when I connect that the light only flashes once, or not at all. I even bought Team Black Hat's little Factory Cable adaptor thingy ( Motorola Factory Adapters) and connected that, nothing. Now, I still notice when I plug it in, the white light flashes, twice, but now I can't get it to do anything. Most recently, I got it to go to the charging screen, it said it was charged up to 100%. I even attempted to do the "battery calibration" but once it got down to 15%, powered off, it took FOREVER to get it to charge and restart. I discovered that if I plug it in, sometimes and after several (20-50+) tries at plug and unplugging, about the time the light should flash the second time it will power on or go to the charge screen. I noticed that if I plug it in the white light flashes, then flashes again after a couple seconds. Hold the power button while standing on my head humming the national anthem, still nothing. I tried all the button sequences I've seen hold volume down and power on for 10+ seconds. It wouldn't start even after leaving it on the charger (yes the factory supplied one) for several days.
Over the last several months, it's been acting very badly. I have a Moto Razr XT912, have had it for well over a year now so warranty is out of the question. I've read several threads on several sites on this topic (one would think Motorola would take a hint and fix this).