Q: cant remove the battery

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The bolt holding the battery in is rusted on and stripped,, only enough room to fit hand down there, tried spraying with wd40 and let sit, but the bolt head is stripped almost to a circle, tried 8mm and 5/16 but they just barely grab, tried going on a bit of an angle but to no avail., the battery is my last effort to fix the "check charging system" light, and it is under fully warranty, so its free for me to get checked, just want to get this thing out! If I got a grinder that would fit down there is it safe to tear that bolt out?

My car has 210000 miles.
My car has an automatic transmission.

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