Fitting larger and larger capacity battery does not solve this problem , and in fact might aggravate it . Because when the electrical power is scarce enough not to be fully charging the stock battery , a larger capacity battery shall remain empty to a greater degree and go bad sooner .
A battery is like a water tank , you can take out only what you put in . If water supply is limited ( like the alternator's electrical capacity ) , and you are using up all that comes , a larger tank won't help any , because you'll have no water to store into it . Further , in case of battery , it must be kept full or nearly so all the time for it to last it's expected normal service life . In case of a sealed battery , deep discharging it even once shall adversely affect it's service life permanently . Fully charged battery is the only happy battery .










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