Another hobby of mine and I'm sure some other members too is electric RC airplanes. We use lithium batteries to power our brushless motors.. For us, there is a wide selection of advanced chargers available where we can set the charge rate, monitor the voltage of each cell in the pack, set various balancing rates, check internal resistance of each cell in the pack etc. etc... More importantly these chargers have a "storage mode" which will either charge the pack up to approx. 50% or DISCHARGE the pack to 50% to miminize loss of capacity and decrease thermal runaway/fire risk when the battery is left for long periods of time... I haven't come across any advanced chargers for e-bikes but surely there must be something out there besides the very basic chargers most bikes come with?