1.Check your battery apperance if they are still in good condition(not deform in shape)
If deform or bloated better call in branch ask for replacement
If not try to check how is your charging
Follow this chart
If still your ebike is easy to low battery even following the proper charging
Call for the branch to test your battery if still under warranty so can provide
You can avail warranty if defect but if not its better so you can find out what is the real problem of the unit
2.If can't do any call the branch to ask for service to check your ebike of bring to the nearest branch to you