Does anyone know how to read the manufacturer code on these batteries.
I saw YouTube video and it was a different language and the guy was going so fast it was so hard to follow!
It’s not in the data sheet. An example of the number from 18650 battery store is.
ME4T
Photo courtesy of 18650 battery store
I watched several more times I think I figured it out.
M=Year 2022
E= Month Februry
4= 4th week of month
T = the Factory in China…Tianjing
Besides Samsung He also gives date code info. For Murata, LG, Panasonic/Sanyo,
Here is link.
Now that these cells have been generally available for some times, I wonder if anyone can comment on the cycle life. From the specs:
① Capacity ≥ 2,940mAh @ after 250cycles (60% of the standard capacity @ RT)
Charge : 6A, 4.20V, CCCV 100mA cut-off @ RT
Discharge: 25A , 2.5V cut-off @ RT
② Capacity ≥ 2,940mAh @ after 100cycles (60% of the standard capacity @ RT)
Charge : 6A, 4.20V, CCCV 100mA cut-off @ RT
Discharge: 45A, 2.5V cut-off
60% capacity after 250 cycles isn’t that good, but I don’t think many of us torture it like that.
Ocelot
December 19, 2023, 2:17am
23
Those are really hardcore constant high current deep (to 2.5V) discharge cycles. From what i recall rhe cycle life is more in line with 80+% at 500 cycles with loads typical in flashlights, like driving SBT90.2.
It is depth of discharge that most quickly erodes capacity over cycle life. I generally recharge at 3.2V but put the brakes on hard to not go below 3V.
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