#1: Gti 138 battery start up power Author: Ben.M, Location: SuffolkPosted: Wed Feb 13, 2013 8:39 am ---- Basically I've just got myself a Gti, the battery went dead the first night I had it but tbh I think that was something the seller wasn't telling me about the battery.
I replaced it with the one that was in my old 1.1L which has a start up power of 400A, is that enough for a 2.0L engine like in the Gti? It just sounds like the battery is struggling to turn the engine over. I does it, but only just!
Thanks
#2: Re: Gti 138 battery start up power Author: Ben.M, Location: SuffolkPosted: Wed Feb 13, 2013 8:42 am ---- The battery it drained had only got down to 12.40V but all I heard was a click from the engine bay when trying to start it. The one I replaced it with is at 12.60V and as I said before, just about does it.
#3: Re: Gti 138 battery start up power Author: Timon2210, Location: PalestinePosted: Wed Feb 13, 2013 1:14 pm ---- well you need a 60AmH battery to start a 2.0 Liter engine,so how much the one you had from the 1.1 is?
but i guess your problem is in the starter motor,not the battery.
#4: Re: Gti 138 battery start up power Author: mtempsch, Location: Gothenburg, SwedenPosted: Wed Feb 13, 2013 1:55 pm ----
Ben.M wrote:
The battery it drained had only got down to 12.40V but all I heard was a click from the engine bay when trying to start it. The one I replaced it with is at 12.60V and as I said before, just about does it.
One common mode of failure for batteries (lead-acid) are that the voltage can seem fairly OK when not stressed, but when you try to draw a big current from them (as when that solenoid on the starter clicks shut) the voltage collapses and the starter won't turn.
A battery in this state (or on the way to it)often also has a large self discharge rate. Ie it might work fine if the car is a daily driver that sees reasonable distances, but if you leave it a couple of days it might not be enough left to start the car.
The smaller battery from a 1.1 (probably 44/45 Ah) might be enough, at least for a while, if the charging system of the car is otherwise OK, the car doesn't do short journeys, and the car normally starts quickly - but the endurance if the car is hard to start is less, especially in cold weather; in short, slimmer margins... I'd go for a new properly sized one.
BTW, how old is the battery from the 1.1?
#5: Re: Gti 138 battery start up power Author: spike_202, Location: West midsPosted: Wed Feb 13, 2013 3:23 pm ---- Gotta agree with timon, sounds like it could be the starter if you have fitted a different battery it rules the battery out as it should still start, I started mine with a sit on lawn mower battery before.
#6: Re: Gti 138 battery start up power Author: Ben.M, Location: SuffolkPosted: Wed Feb 13, 2013 4:27 pm ----
Timon2210 wrote:
well you need a 60AmH battery to start a 2.0 Liter engine,so how much the one you had from the 1.1 is?
but i guess your problem is in the starter motor,not the battery.
Just looked it up and the 1.1L's battery is 40AmH, only a year old I think.
Ok, I had no idea that could happen mtempsch, I'm really hoping its the battery that's the problem but I'll update this post in the morning regarding weather it starts or not :/
Thanks for your help guys!
#7: Re: Gti 138 battery start up power Author: Ben.M, Location: SuffolkPosted: Thu Feb 14, 2013 10:22 am ---- Meant to write this earlier but was busy. Anyway, the car started this morning so I think it must have been the other battery. If I have this happen again I'll update this post again,
Thanks
#8: Re: Gti 138 battery start up power Author: Timon2210, Location: PalestinePosted: Thu Feb 14, 2013 1:22 pm ---- well glad it started,keep us posted
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