So after 5 days it is at 4.16v?
Sounds perfectly fine to me. Mine do the same thing, like I said before they will drop from 4.2v down to somewhere around 4.12-4.16V and then they will maintain that for extended periods.
What do your cells look like after a few months?
Naturally they will drop some voltages over time by .01V a month is nothing to worry about. High drain cells tend to have higher self discharge rates from my experience.
Don’t worry about a voltage drop over the first few days, worry about it over the course of weeks/months.
If the voltage is down to 4V in say 1 month, then yeah, you have an issue. At the rate the voltage was dropping in the first few days the cells should be empty in a few weeks but I am going to go out on a limb and say that doesn’t happen.
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My post,it did not quote properly!
I think you misunderstood some of my points.
The VTC5 was an example of another Sony battery. This was a compliment compared to the 5.5. month old VTC6!! Hence: VTC6 resting voltage @ 4.14v after only 8 hours versus a 21 month old VTC5 resting voltage of 4.16v after 5 days!
My experience has been different[positive] w/ my other VTC4/5 Cells than yours…which was:
“I see this regularly, particularly with sony cells. They just don’t like maintaining 4.2V for some reason. They tend to drop down to around 4.15V or so and then maintain that for extended times.”
The whole point is that these VTC6 batteries are having resting voltages lower than batteries that I have that are 5 or 6 times older.
Sure, what matters is how will they be 6, 9, 12 months from now?
All I am saying is that from my 5 years experience w/ L.ion batteries, when cells start to have a quick decline in resting voltage it usually continues and is a sign of further degradation.