Hi guys.
Newcomer here. Building a large power wall.
I have harvested cells from around 450 batteries. All batteries were Lenovo, and they have been disposed because the computer refurbished didnt want to resell the computers (not worth refurbishing) many batteries have been tested from the refurbisher to grade a.
That means that they were not thrown out because they were dead.
Anyway, got 2700 Sanyo / LG cells rated at 2500-2600 mah.
I purchased two chargers from the battery doctor.
So to the question. If I take 100 cells, maybe only 30 of those are above 3.0 volts. Ive read that cells below 3,25 volts have too much internal resistance and should be thrown out(recycled)
The batteries have been in storage for servers years before I got my hands on them.
Question 1.
So what do you suggest? Charge to 4,2 and test in two weeks, and dispose all below 4 volts ?
Most of the cells are 2,25 to 2,7 volts.
Question 2.
I noticed that if I charge them up, within the first 5 minutes they will all be in high voltage, like 3,6 volts. Why is that so quick? The whole charge process takes a long time, 3 hours or so. Whats the reason for the quick voltage jump?
Greetings from Denmark.
Newcomer here. Building a large power wall.
I have harvested cells from around 450 batteries. All batteries were Lenovo, and they have been disposed because the computer refurbished didnt want to resell the computers (not worth refurbishing) many batteries have been tested from the refurbisher to grade a.
That means that they were not thrown out because they were dead.
Anyway, got 2700 Sanyo / LG cells rated at 2500-2600 mah.
I purchased two chargers from the battery doctor.
So to the question. If I take 100 cells, maybe only 30 of those are above 3.0 volts. Ive read that cells below 3,25 volts have too much internal resistance and should be thrown out(recycled)
The batteries have been in storage for servers years before I got my hands on them.
Question 1.
So what do you suggest? Charge to 4,2 and test in two weeks, and dispose all below 4 volts ?
Most of the cells are 2,25 to 2,7 volts.
Question 2.
I noticed that if I charge them up, within the first 5 minutes they will all be in high voltage, like 3,6 volts. Why is that so quick? The whole charge process takes a long time, 3 hours or so. Whats the reason for the quick voltage jump?
Greetings from Denmark.