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Flashlight Enthusiast
Seems my 3400 mAh Panasonics only get charged to about 4150 mAh based on the display. I tested them with a volmeter it says 4.2V. It lacks more granularity than that.
Opus BT-C3100 not charging to 4.3V
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Presumably you mean 3150 not 4150. What voltage were they resting at when you started the charge? If 3.33V or above then that is where your missing 5% lies, i.e. you started charging them at 5% capacity, so the charger will only show the remaining 95% it actually charges. You'll need a higher precision meter to verify the charge termination voltage.
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Flashlight Enthusiast
Whoops, typo.
I charge my 3500 mAh batteries when the voltage hits 3.5V or so, sometimes less sometimes more. I don't usually go down down into 2V like 2.5V.
Upon taking them out of the charger,the number that reads on the charger when it quits is 4.150V, not 4.300V like it should.
An independent voltmeter test shows that it's closer to 4.2V than 4.3V.
I charge my 3500 mAh batteries when the voltage hits 3.5V or so, sometimes less sometimes more. I don't usually go down down into 2V like 2.5V.
Upon taking them out of the charger,the number that reads on the charger when it quits is 4.150V, not 4.300V like it should.
An independent voltmeter test shows that it's closer to 4.2V than 4.3V.
ChrisGarrett
Flashlight Enthusiast
We want the 4.20v number, not the 4.30v number, which is out of spec for 3.6v/3.7v cells.
The cells will drop a bit, once the charge terminates and/or they settle for a day. Of course, if they're tired cells, then they won't be anywhere close to 4.20v after a stretch.
You can drill a hole in the bottom of the BT-3100 and access the voltage/chemistry slider switch and charge up 3.8v cells (4.35v), but then they should terminate at ~4.35v, not 4.30v.
Chris
What version is your Opus? Early versions had a bug that caused it to take very long to charge to 4.35V (LiHV) because it entered CV too low. This might be your problem (and/or your cells are unhealthy with high IR). Presumably you know that you need to use the internal switch to change it to LiHV mode.
WalkIntoTheLight
Flashlight Enthusiast
Are those cells designed for charging to 4.35v? If not, then don't do it. At best, you're stressing your cells and causing them to age prematurely. At worst, you're creating a safety issue.
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Flashlight Enthusiast
like everyone else here, I have a mix of 18650s that take 4.35V and a trainload of older 4.2V ones.
