Charging over 4.20 volts/cell is very dangerous for NMC lithium chemistry (all bike batteries). This behavior will cause overheating and leads to thermal runaway (fires). Any decent BMS will not allow this kind of overcharging.
Mostly correct except for 2 related data points:
1 - Battery life is compromised the longer the State of Charge (SOC) remains close to 100%.
2 - Battery life is extended when batteries are stored at 50% SOC.
Therefore, "charging after every ride" is detrimental to battery longevity. The...
Batteries are not really mechanical, so it is VERY unlikely that jumping type riding would cause an OEM battery to become unbalanced. Even a bad crash.
The more likely cause is an electrical component failure internal to the battery pack. Either a cell went high impedance or a component in the...
I am an experienced battery builder and a EE.
I suggest a book by Micah Toll titled "DIY Lithium Batteries: How to Build Your Own Battery Packs". You will need a quality spot welder and lots of pure nickel strip. And balls of steel.
BMS choice is the most important ingredient, and the...
Wiha 33496 8-Piece Soft Grip T-Handle Ball End Hex Metric. US$58 on Amazon. I have been using these professionally for at least 10 years
Now that the Bondhus patent has expired, all major tool companies make ball end hex keys. The critical thing to keep in mind is to never use the ball end...
It is MUCH more important to keep cell groups balanced than avoiding keeping cells at full voltage.
So it is OK to charge to 60-80%, especially for storage. But every few charges need to be to 100% for the BMS to balance the parallel cell groups.
Can you describe what "...failed to wake up..." means?
Are they dead and cannot be revived? Or did they not "wake up" with the vibration sensor that allows AXS devices go to sleep and then wake up when the bike is moved?
Did you try a standard AXS battery? Did you push the button on the side...