Standard battery drain for parasitic comparison

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MR2DI4
Posts: 1110
Joined: 20/04/11 23:18
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Years of MR2 Ownership: 21
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Real Name: Carl
Location: Auckland >>> New Zealand

Standard battery drain for parasitic comparison

Post by MR2DI4 » 08/02/19 20:59

I decided to measure my battery drain as the current battery went flat over a couple of weeks without driving the car.

What I did was remove the negative terminal with a multimeter already connected to the negative battery lead with a clip and a standard probe lead on top of the negative battery terminal while I pulled the negative terminal up over it so it didn't break the connection.

I have pretty standard stuff like aftermarket stereo and an Alarm.I was worried I suddenly had some sort of Parasitic drain.

Basically I get 25mA which is acceptable for a MR2.

Looks like my battery is on the way out, its 5 years old and wasn't a good one, back to Yuasa if I can find one.




timnutt
Posts: 119
Joined: 03/07/17 15:14

Re: Standard battery drain for parasitic comparison

Post by timnutt » 12/02/19 19:41

Good to know the drain. I have a similar problem, and I was going to ask was a sensible drain was. Maybe my battery is on the way out too.
Thanks

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Topic author
MR2DI4
Posts: 1110
Joined: 20/04/11 23:18
Gender: Male
Years of MR2 Ownership: 21
MR2's Owned: 1
Real Name: Carl
Location: Auckland >>> New Zealand

Re: Standard battery drain for parasitic comparison

Post by MR2DI4 » 12/02/19 21:00

Yes it was 25.4mA or something as I had my meter on the 400mA range.

I didn't break the connection totally and then reconnect with the meter because I don't know if anyone else has noticed but you can get quite an inrush current on a re-connection.

I would think this is normal for an older car, probably lower on a modern vehicle with lower power electronics these days I expect about 15mA.

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