|Performance after storage your battery at 3.85V vs. 4.2V (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 storaged at 3.85V (15.4V) and the other at 4.20V (16.8V).
Will there be a difference, and if so, how strong will it be? And after what time of storage?
This is a long running test that will be updated regular. So come back to see the development.
Here we go, the first results are online after one month of stograge time. So let´s take a look what happened. (Be aware that different batterys may vary in how strong they degenerate.):
The battery stored one month at 3.85V (only used ones for the measurement) did loose 0,89% of the performance, something I did expect. Batterys do degenerate over time, even if you do not use them. So even if you do keep your battery perfect storaged, after a few month it will loose performance.
The other battery, that was stored at 4.2V the whole month, did lose significant more performance. 3,56% performance loss, 2,67% more that the 3.85V stored battery. This loss in performance is more than the batteries of the 50 cycle charge test did lose in the same time of strong usage (but stored at 3.85V between usage).
So if it is possible for you, keep you batterys at a storage Voltage while you do not need them for a longer period of time. It´s your decission if 2,67% more loss in performance after one full month is too much, or acceptable. However, keeping the batteries charged for a few days will be not so a big deal in comparison. With this data online, we will have to wait again. This storage test is still ongoing, will the 4.2V degenerate faster over more time? We will see in 4 weeks.
Change of performance (dynamic race test) over time.
Baseline of the battery that is always storaged at 3.85V and only will be charged for the test after X days. 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 storaged at 4.20V and only will be charged for the test after X days. This will be updated with the measurements over time, as soon as the difference in performance is big enough to really see it.