battery leaking 93 altima

hi, i have a 93 altima and this is the third battery i've gone through in the last 6 months. the battery keeps leaking and is now swelling on the side. i've tried cleaning the terminals but nothing. the mechanics said it was overcharging but i don't how to stop it from overcharging. they tested the alternator and battery and they both output the corrected volts. there is one thing i could think of, the connector for the alternator fuse seem to be somewhat corroded. it was cleaned but it still looks a bit dirty. i have no ideas on what could be causing the overcharge. It doesn't happen everytime. so its kind of hard to find out extactly what is causing the problem. Does anyone have any ideas or a solution? Thanks

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ryuujin
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