I everyone, i have a question here and need some advice.

My PGM4 battery will run low (that is below 11.7vdc bike cannot kick start), have check charging from coil ok. Even if i change a new battery after half a year or so same thing happen. My friend told me is the distance i travel, too short, less then 10km. So before charging take place i have reach my work place. When ever i have this problem, i'll charge my battery, after charging the bike can start again but after three month or so, problem comes back again.

How can i over come this problem?

I'm using a YT4L-BS 12V3Ah battery, any recommendation?

If i change to a bigger size, will it help?

Thank you.