Battery Battery drain - amp (parasitic current) question - Civinfo
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post #1 of 6 (permalink) Old 26th August 2019, 12:33 Thread Starter
 
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Question Battery drain - amp (parasitic current) question

Hi all,

I checked on Civinfo's wiki on flat battery to troubleshoot battery drain.

The wiki said that the normal drainage is 0.02a after initial connection.

When I first test my car battery for amp (parasitic current), it was 0.55a at the start but after few secs, it came down to 0.05a. I continued testing it for next 30 secs (without breaking connection), and it was still 0.05a.


Is 0.05a acceptable or not acceptable?

I am concerned because I am not expert on electronics and the wiki said that it should be 0.02a and yet in my case, it is 0.05a. I don't know if that is okay or not okay.

Thank you for your advice.

PS In case you ask - the cause of drainage is from Fuse 16 under bonnet - aka "back up" fuse.
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post #2 of 6 (permalink) Old 26th August 2019, 16:13
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Firstly, check to see if the current is still the same after about 10 mins (of constant ammeter connection) to make sure that the car has completely 'shut down'.
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post #3 of 6 (permalink) Old 26th August 2019, 17:37
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Must be something in the air, seems like parasitic drain week!
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post #4 of 6 (permalink) Old 26th August 2019, 20:30 Thread Starter
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Thanks for the suggestion. I forget to mention that my car does not have HFT module/box.

1.) Does 10 mins waiting still apply?

And 2.) if it is still 0.05a after 10 mins of constant connection, what does it mean? That I still have parasite drain?

thank you very much.
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post #5 of 6 (permalink) Old 26th August 2019, 22:40
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Obviously you do have a parasitic drain as the quiescent current is not zero.
I don't know what the Honda spec is and don't know whether 0.05A (50mA) is an acceptable value or not. I was hoping that someone in the know would be along to tell us.
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post #6 of 6 (permalink) Old 26th August 2019, 23:52
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From what I understood it should be around 0.03 so 0.05 is not too bad. My last civic had a drain of 0.9 and of course the battery went flat after a week or so. I suspected the alarm siren. Its common for the on board battery on the siren to fail after a few years and then it draws power from the cars battery. Happened on a peugeot I had as well.
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