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leaking/exploding batteries are generally a sign of a failing voltage regulator that lets voltage spikes cook the battery (and not of a weak/dying battery). If you're monitoring voltage while driving, etc. (not just occasionally spot checking) you should be able to catch these spikes and avoid frying your battery.
I'm of the "if it ain't broke don't fix it" school regarding older batteries -- and carry jumper cables so that when it does fail/lose charge capacity I can get home to address.
A weakened battery will generally first show itself when exposed to cold weather -- if your car struggles to start when it's COLD (hard to do in So Cal), good sign the battery needs to be replaced. Also, a few complete discharges can take their toll of battery longevity -- if you have a few under your belt, could be getting close. Finally, many auto parts stores have a device available for a free battery check - this could give you some peace of mind
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