Most of the problems with charging is related to cheap no-name bikes and / or mismatched chargers. People misplace the correct charger and plug in something similar thinking there is no difference and set their bike ablaze. OR… people buy cheap and are surprised when it’s…. Um… well, cheap!
better brand name machines have proprietary plugs to prevent the use of the wrong charger as well as far higher quality components.
the manufacturers, both of our in house systems and the Bosch systems used on some of our bikes, recommend charging in a warm dry environment. Don’t completely drain the battery before charging and don’t fully charge the battery. I charge our e-bike outside when possible, charging it when it gets down to 10 to 20% and charging it up to about 90%. The batteries are supposed to be good for about 1000 cycles.
Interestingly, corporate has ruled that we are not allowed to leave bikes charging overnight.
having seen a laptop go up in flames on a boardroom table in the middle of a meeting I really don’t trust lithium ion batteries and can’t wait for the sodium units to become more popular as that technology develops.