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macafee2 · 13th September 2021, 07:13

Went to start a car yesterday that had a flat battery, so flat the engine would not turn over.
Using jump leads I connected up a spare good battery that seemed fully charged. Still the car would either not turn over or only just turn over.

Did the flat battery nick "all" the power from the good battery and leave "nothing" for the car?

I had to connect my car up and leave the engine running for 5-10 minutes before the car with the flat battery would start.

macafee2

13th September 2021, 07:13	#1
macafee2 This is my second home Rover 75 Saloon & Tourer Join Date: Sep 2012 Location: Lincoln Posts: 14,924 Thanks: 1,630 Thanked 3,032 Times in 2,181 Posts	jump starting a car with a flat battery Went to start a car yesterday that had a flat battery, so flat the engine would not turn over. Using jump leads I connected up a spare good battery that seemed fully charged. Still the car would either not turn over or only just turn over. Did the flat battery nick "all" the power from the good battery and leave "nothing" for the car? I had to connect my car up and leave the engine running for 5-10 minutes before the car with the flat battery would start. macafee2