Hello,
I’m wondering if my new Capacity Tester is bad or the first battery I tried testing is bad? It’s the exact capacity tester in Will’s video:
I tried my first capacity test using that cheap $40 capacity tester that Will had on his channel. For some reason I can’t get it to work, but it might be because of the battery?? Maybe I discovered my first bad battery?
- I top balanced the battery at 3.65v until the charger showed 0 amps going in.
- When I hooked up the cell to the tester, it showed 3.52v
- I watched the video again and set up the capacity tester so it shuts off at 2.60v as a Low Cutoff Voltage like he recommended.
- Then I adjusted down the current to 20A, which on my battery is 2C, just like in the video.
**Almost immediately, the Low Voltage alarm went off and the test stopped immediately. The screen flashed “2.60!” I couldn’t resume the test because the battery would instantly drop down under 2.6v during the test??
I grabbed a multimeter and it was actually displaying 3.17v directly on the cell. So maybe the capacity tester is bad??
I was forced to turn down the current to 15A and the voltage on the Capacity Tester says 2.7v which is dangerously low and close to shutting off the test again. The multimeter directly on the cell showed 3.102v. So maybe I have to turn it down all the way to 1C 10A???
Im thinking either the cheap capacity tester is bad or the battery cell is bad. What do you guys think?