Hi consult your owners manual or if you do not have one, visit Suzuki workshop and find out the exact specs for battery. Never install under or over amperage battery as it would ruin your electrical systems. If you have correct specs batterly installed and its giving problems pls check the cutout, if it goes faulty it effects the charging, also there are many other issues involved, generator, belt, leaking wiring etc, have a thorough checkup as well