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yes the battery is still usable. look at the battery closely and see if there is any bloating or cracking or leaking anywhere. also check your main power wires to your fuse box, alternator, and starter and make sure u haven't blown any fuses or fuse links or burnt up any wires. if the pos and neg terminals were just touched together briefly then ur fine but if they were in contact for a while follow the above statement i made. hope everything is fine and good luck!

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Q: Is a battery still usable if a wrench touches both terminals?
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