How to Know If It Is Only A Battery Problem

[RaGa]

thanks bro!
naalala ko lang kasi si motolite ko noon, umaabot ng 8volts
tapos nung ma check ng taga motolite, may sira na cell and malaki na bawas sa tubig (MF)

Experienced ko naman dati pumalo ng 16V pataas reading ko.
As i have checked the battery, lumolobo at overcharging na.