when is a battery "dead"

Submitted: Thursday, Nov 26, 2015 at 19:03
ThreadID: 130987 Views:3686 Replies:5 FollowUps:14
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HI all. I have a basic knowledge of 12 volt electrics -or so I thought. The other day I was asked to jump start a neighbours car with a "flat" battery. Lights had been left on for 4 days.
I thought it would be better to hook it up to the ctek over night rather than jump it as the owner was not intending to drive it around that much after the start. Hooked up the ctek and it didn't register on the doc meter. I then hooked up a multimeter across the terminals- it read 1.4 volts. Checked other batteries- all good. Checked the flat one again- 1.4 volts. I suggested it might be time for a new battery and left it at that. Apparently the neighbour has since jumped the car and said the battery is working fine. This has me stumped. I really thought 1.4 would mean non redeemable. Any thoughts? Ta doc.
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