I have heard people say they are still running on the same battery after 5 years.
Hope so as i have seen the same battery priced at around £300.00
Pah, you're lucky, batteries for Bosch and Kalkhoff ebikes are up to £700.
Battery longevity comes down to two things, cell quality and use the battery is put to.
You wouldn't expect top quality cells on a battery for a budget Chinese ebike, although they may be branded, so all is not lost there.
As regards use, running high power motors thrashes the cells and shortens their life.
You have a fairly low power motor, so it won't be giving the battery a hard time.
Cells last longer if they are used regularly, and used from close to full rather than close to empty.
Charging after every ride - unless it is literally only a mile or two - is best for battery longevity.
On t'other hand, a full charge stresses the cells, so they are best not left for long periods of time fully charged.
No problems if you use the bike regularly, but were you going to stop using it for a while, the battery should be left part charged - roughly half to three-quarters.