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I understand your point. I understand your explanantion. The reason for that is fast charging creates a film of passivation on the surface of the electrodes causing the resistance to charging to go up, therefore the real capacity is less than what the apparent charging voltage would suggest...

you may need to do that just once, after a long period of storage. That will bring your battery to a known state (100% charged).

that's not necessary, especially if you have a recent battery and charger.

you have already got it with your charger. There is not much justification not to use it in the recommended way. Years ago, BMSes and chargers were not very good so people had to look for ways to improve the process but those precautions and workarounds are no longer necessary. Things like...

that depends on the BMS in your battery. Passive balancers use bleed resistors and start balancing when your battery is mostly full. Modern BMSes have active balancers that use a series of switches to shunt the charge from the cells with most charge to more depleted cells when the battery is not...

The test motor is not yet a finished product. Go to the last 5 minutes, his motor went into safe mode. His CYC motor did not inspire confidence either. It's only a bearing but it should not become notchy so quickly.

can someone figure out why Stuartsproject got only 106 minutes in discharging time when charging to 41V while he got 135 minutes on the same rig when charging to 42V? I can't think of any reason. His data: Rest volts 41.7. 41V, 0.01Ahr,0min 40V, 0.384A,10min On the face of it, between 41V and...

No. I always charge my battery until the LED on the charger goes green for about 5 to 10 minutes. If I check the voltage of the battery after disconnecting the charger, I usually read 41.3V to 41.5V.

Not many since I use Samsung and Panasonic cells. I reckon we retire less than 1 battery per thousand per year.

I am asking about your own batteries or those that you have fixed. This is because BMSes have active balancers that work continually in the background.

Saneagle test is very well done. He found that between 42V and 41V (for a 36V battery) you'd lose 3.1%. It's believable because the slope Voltage/Capacity is highest between 41V and 42V and also below 35V so the loss is between 0% (if the slope is infinite) and 10% (if the slope is the same for...

My Sans chargers output is 42V when the LED on it turns green but the battery voltage is between 41.3V and 41.5V. Saneagle uses How do you charge your battery to 41V? Do you use an adjustable PSU? Saneagle discharged his pack a lot more slowly to avoid voltage sag interfering with capacity...

Do they ask their component suppliers to follow the same doctrine?

I learned about statistical methods of quality control (acceptance sampling) in 1969 or 1970. The math wasn't new, they existed back in the 1020s. We were taught Poisson, Bernouilli and Bayesian statistics and the Japanese production methods were always cited as examples. What they did was...

Close enough is good. You can adjust the gap with extra washers or another cable tie saddle. Send some pictures to Andy.

When was the last time you saw a pack out of balance? If you consider everything, would you agree that lower voltage equals also to lower fire risk beside longer life?

Email Andy for the seat post mount and a new magnetic ring, you already have the sensor.

I disagree with that conclusion. How often your battery is completely flat in the last 5 years? Statistically, people put their battery on charge far too soon for fear of running out on the next outing rather than when their battery is flat. Charging when the battery is 80% or more full does not...

Saneagle's test is much easier to understand compared to Padja's though. Saneagle also explains the point in plain English. You may lose up to 3% of capacity if you charge to 4.1V but you gain in longer battery life.

thank you @saneagle. I reckon your BMS is similar to mine, it won't charge the cell above 4.15V. We lose only a small amount (3.1%) of charge between 54.6v (4.2V per cell) and 53.3v (4.1V per cell), and less than 1.5% between 4.2V and 4.15V.