|Performance after charging your battery at 1C vs. 5C (ongoing long-term test started on 01.09.2017)|
The goal for this long-term test is to monitor the development of 2 identical batteries, one always charged at 1C (1.6A) and the other at 5C (8A).
Will there be a difference, and if so, how strong will it be? And after how many cycles of chargeing can we see some changes?
This is a long running test that will be updated regular. So come back to see the development.
The first results are online after 50 cycles of charge/discharge. So let´s take a look what happened. (Be aware that different batterys may vary in how strong they degenerate.):
First of all, the performance loss of keeping your battery storaged at 4.2V over one month is bigger that the usage of 50 cycles over on month, no matter with how much C you did charge. See the other long time test here in TheLab.
If you take a look at the results after 50 cycles charging with 1C vs. 5C you could think that I did mix up the results. But no. I did the measurement multiple times, and the result stands. But let´s take a minute and look at the single results. The battery that was always charged with 1C (1,6A) did lose 2,88% performance over the 50 cycles. This is still less that what the battery had lost that did stay charged at 4,2V for one month. But this is something I would expect if I use a battery. However, this is not the part of the result that mad me scratch my head.
Here comes the result of the battery that always had been charged with 5C (8A), it did lose 1,53% performance over the 50 cycles. No, a mix up is not possible, this results are in, and no matter how often I repeat the measurement, this stands.
And no, I will not claim that charging at 5C will be better for your battery than charging at 1C! What we see here is a difference of 1.35% in performance, that also could be caused by variations in the cells itself. I think we will see more after the next 50 cycles, so this test will undoubtedly need more cycles to see the long time effect.
Until now I do think that this variation is normal between even the same batteries out of the same batch. But what I can tell about this packs(!) I do have here for the longe time tests:
Charging with 5C does not reduce your performance more than charging with 1C after 50 cycles. It remains exciting how performance develops over the next 50 cycles. Wait for the next update.
Change of performance (dynamic race test) over cycles.
Baseline of the battery that is always charged at 1C (1.6A) and always will be discharged with the dynamic race test. This will be updated with the measurements over time, as soon as the difference in performance is big enough to really see it.
Baseline of the battery that is always charged at 5C (8A) and always will be discharged with the dynamic race test. This will be updated with the measurements over time, as soon as the difference in performance is big enough to really see it.