Firstly, any lithium battery must be treated with care as they do pose a fire risk. All major ebike brands use cell brands such as Panasonic, Samsung, etc, which greatly reduces fire risk. But fires can still occur (same for Lithium batteries in laptops, cell phones, etc). Charge your battery in a fire safe area, with a smoke alarm nearby so, if something did happen, fire will not spread.
For general maintenance, give your battery a full charge at least once a month and if you do not use your battery over winter make sure it is left about 90% charged and topped up every 3 months – you can really shorten your battery’s total life by leaving a low charged battery for several months.
Handle your battery with care – heavy knocks can cause internal damage and increase risk of failure.