What's the best maintenance practice for batteries?

1. Avoid excessive heat/leaving the battery under the sun.
   Ideally, batteries should be stored at room temperature:  50 °F – 77 °F.
2. Recharge your battery before it's fully drained. It's not a good idea to fully drain your battery.
3. Do not leave your battery fully charged for a long time. While this may seem like a good idea, keeping your battery 75% charged while storing is a better practice for the longevity of your battery. 
4. Do not keep the battery on the charger for long periods of time (>12 hours).
5. Do not use fast chargers. 

And please do not forget that this is the most expensive part of your ebike which needs a little more attention than the other parts of your ebike.