if you are complaining about the battery not lasting long ( ie 18 - 24 months ) then the answer is simple ... ride it more.  battery life is best when bike is used all the time to prevent sulphar build up on the plates .  trickle charge is a very poor second best .   so now you know. !

If its a battery you add water to you can add some "inox" - best added when you first get the battery, but even on an old one it cleans the plates and keeps them healthy.

replacing my battery today, 6 years I don't think is to bad