What is a E-Bike battery made of?

E-Bike batteries are normally made of lithium compounds to make a Li-Ion battery, usually made up of lots of smaller 18650 size cells within a casing. The batteries should be cared for in the same way as mobile phone batteries, avoid heavy knocks or piercing the battery pack, and must not be left completely uncharged for long periods of time or they may eventually become incapable of holding a charge at all.