Need new battery?

ekferio

Hi I haven't started my car for months and it won't start even when I try to jump start it. At first it made fast clicking sounds, but after leaving the jumper cables and donor car on for 30 minutes, no clicking sounds anymore, now it makes half a cranking sound and goes dead. All the lights can be turned on. New battery needed? Also where is a good grounding spot in the engine? I clamped it to one of the hex bolts on the strut bar.

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My black Z build