Once the pack reaches 3.6 volts i disconnect the charger then let it sit for an hour. Correct?No ..... just make sure you adjust the power supply before connecting it to the parallel pack and then don't touch it again.
Cells with higher capacity will take more current to get to 3.6 V and lower capacity cells will take less current .... but all will come to 3.6 V and the current from the power supply will taper off to zero.
After fully charged, I would let it sit overnight still connected in parallel but with power removed.Once the pack reaches 3.6 volts i disconnect the charger then let it sit for an hour. Correct?
Then check voltage if voltage is above 3.5v the pack should be balanced. Right?
The higher your voltage, the better matched voltage levels reflect proper balance, but they settle-down do quickly from 3.6 or 3.65V that unless you have equipment to measure from all cells at the same instant, it’s exceeding difficult to measure voltages way up in the charge knee where they are meaningful.Once the pack reaches 3.6 volts i disconnect the charger then let it sit for an hour. Correct?
Then check voltage if voltage is above 3.5v the pack should be balanced. Right?
charging at 3.6v is kind of slow when the voltage reaches around 3.570v.The higher your voltage, the better matched voltage levels reflect proper balance, but they settle-down do quickly from 3.6 or 3.65V that unless you have equipment to measure from all cells at the same instant, it’s exceeding difficult to measure voltages way up in the charge knee where they are meaningful.
As already stated, leaving a parallel-balanced pack connected overnight after charging, or even 24 or 48 hours is the safest way to assure charge balance continues and all cells settle to an identical voltage.
You can even let settle overnight and then recharge to 3.6 or 3.65V the next day.
With each cycle, overall state of charge increases and balance improves.
Once you see the approximate same settling voltages the next morning, you know that the incremental charge you are adding every morning is just enough to offset overnight leakage (self-discharge).
It’s really a question of how much time you have and how much of a perfectionist you are (but only one hour after the the first balance cycle is insufficient).
3.65V is safe, even 3.70V, but you’ve achieved most of what you!re aiming at if you reach 3.60V.charging at 3.6v is kind of slow when the voltage reaches around 3.570v.
it take ages to reach 3.6.
is it safe to do 3.65v?
Let the voltage reach 3.63X then just continue charging? till the amps go below 1.0?
or should i disconnect once the voltage goes above 3.6v?
Did you mean you put them in series and applied a LOAD to the battery to deflate it?But I did a stupid thing, I put my charger at 4.60 instead of 3.60 volts. When I saw my mistake the cell was beginning to 'inflate' so I stopped everything, put them in series and put a 45 amps charge on it to try to 'deflate' it.
The cell did not deflate but it stopped inflate.
That was 3 days ago. I came home today and the cell was really big, it continue to inflate during the weekend.
I tried to take a picture of it, but the photo do not really show the actual size of the cell.
I ordered another cell from my Alibaba seller, but I need to know.
Is it safe to use that cell ? Is that cell still good ?
Yes when I saw that I made an error of voltage I put them in series and applied a load (the voltage was more then 15volts). After 5 or 6 minutes of load, the voltage was under 13.5 volts. So I figured that the expansion of the cell was stopped.Did you mean you put them in series and applied a LOAD to the battery to deflate it?
Did you bring it way down to 3.2 or lower and it still expanded?
I would probably not use that cell. It would kill me to restart the 75 to 90 day wait again for shipping.
Best of luck.