I have heard about galaxy s3 exploding while charging(yes, there are reports on the web already, just google if interested), and there are just so many posts talking about all kinds of charging problem that galaxy s3 has. For same charging method(plug in the cable while the phone is off), my other good galaxy S3 would vibrate once, then the gray empty battery symbol with white circle inside, then a battery symbol with "green fluid" filling up inside representing the power percentage. one of them continually vibrate with black screen(about 1 vibrate every 5 seconds), the other one vibrate every 5s too with the gray empty battery symbol respectively. I've two here that don't charge while the phone is off(normal while on). am not a specialist in the field so not quite sure what chemical differences are causing this.īTW, the galaxy s3's charging function is quite bad indeed. So, I think this isn't an issue but intended. and sure the battery's nominal voltage is 3.8 printed on the battery. So I suspect its max voltage is set to 4.3, which then would have a nominal 3.8v or so rather than the most seen 3.7v. When the galaxy s3 show 90% power, I take the battery out and measure it, already 4.215 volt. That's why I was wondering If everyone's else's battery voltages were the same as mine.Īs one of the previous posts said already, 4.2 or 4.25 is what I know the max for li-ion batteries for these years. It's possible the voltage sensor in the phone is off. I called Samsung and they said that the battery's normal charging temp can be as high as 99f so at least my cell isn't showing any signs of overheating yet. I read that the HTC evo 3d had issues of overheating due to being charged at 4.3v and people's batteries were going bad. Unless Samsung is using some super lithium ion battery with a different chemistry which can support 4.3xx volts then our batteries are getting stressed pretty hard. It has something to do with the chemistry, lithium ions are somewhat sensitive to voltages. From what I have learned anything over 4.205v is pretty bad for the cell and can cause a decrease in performance over time and cause the cell to fail much quicker than normal. Manufactures push these batteries as close as they can to 4.2v to get as much juice out of them as possible even though it's harder on the battery. Lithium ions don't like being deep discharged and they don't like being kept at high voltages(i.e. It's the absolute upper limit of its recommended voltage range. 4.2 seems to be a critical voltage with pretty much all lithium ion cells. Battery university has some good articles on lithium ion cells and how they should be treated. I've done my fair share of research on batteries in the past as I was always interested in getting the most out of my devices.
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