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...
This.
I bought my Levo in 2018, and at that time Spec had the BEST control loop / torque sensor / motor controller integration by far. Very smooth, natural application of power on startup and stopping.
I have no idea what the current competition is doing, but I suspect they have caught up...
YES, if you want to preserve cycle life (overall number of charge cycles). I own one of these from Luna Cycles. This is much more controlled than using a timer arrangement.
However, these will create cell imbalance if used exclusively at any setting other than 100%, as the BMS only balances...
Yeah, I forgot the obvious "damage to the cells" problem. Any Lithium Ion cell that has its casing compromised is a potential bomb that needs to be treated with caution and care. Put it outside. Do not use it.
There was a time when new, quality cells were difficult to obtain and expensive. Many people recycled cells from retired battery packs (think laptops and scooters) to make upscaled packs. Some of those upscaled packs went into bikes.
Upcycled cells are never well-matched. Even if you...
I think that most fires are associated with using recycled cells and other bad building practices (see "hover boards"). I doubt that any modern commercial ebike batteries catch fire.
Because whatever caused the initial imbalance (likely higher cell resistance) will likely get progressively worse. The parallel cell group at a lower voltage when the charging stops will remain at a lower voltage (cuz no balancing).
If they are only 5 mV down with each charge cycle...
First off, batteries with quality cells charged with an OEM charger will charge at a relatively slow rate. Most cells are rated at a 1C rate. This means you could charge to 100% in one hour. But the OEM chargers charge at a very conservative rate of ~.2C (or so). So the cells do not get...
A well made battery should not be affected by shock and vibration. There is little room for movement, which causes fatigue and strain.
Having said that, I am deep into rebuilding a friend's e-bike pack that was made with nickel-plated steel interconnects.
Nickel-plated steel is well known in...
Keep your batteries inside if at all possible, especially while charging.
As for me, I am using the "Trail" power setting more often during rides instead of "Eco" to keep me from getting overheated.
I rode this morning in 95F (35C) and still climbed 1500 feet (460m) in an hour.