I have 2 Varta batteries that, from new, would happily go flat with no load. The one in my tractor I have to keep on charge with a solar panel or it will not start. The other one has been demoted to driving a small irrigation pump and is also constantly on charge.
Maybe I was just unlucky. See if it holds a charge when the weather turns cold.
I'm now beginning to wonder about the battery, it's still under warranty until next month but again hard to prove a fault to claim.
This is why you monitor the resting voltage and the fully loaded voltage (cranking the engine)
I would leave your LPG ECU disconnected and see if it still goes flat. The BECM as has been said should draw between 30 & 50ma when asleep which should not cause the battery to go flat in less than a week.
Get a CCA test done on it. If it doesn't measure close to the stated capacity, they should exchange it.
Most folks now only seem to get out the digital tester which 'determines' CCA and doesn't actually measure it
wakes the whole car up
Battery fully charged yesterday its now been off charge on the bench for 12hrs voltage has dropped from 13.25 to 12.7 v and as its raining won't be putting it back until tomorrow so another 24hrs sitting on the bench.
Unfortunately, holding voltage does not mean that the battery is OK, it may well have lost capacity. Crank then immediately stop the engine and see what voltage the battery recovers to, that will give some indication of capacity.
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If 9.4 is accurate, that's very low indeed and I'd suggest your battery has had it, on its last legs, but.. what is the CCA? I would dare to say it shouldn't get much lower than 10.8.. maybe 10.5 at a push (while cranking)
This is the spec of the battery.
I was just looking at that very battery online.
+1 I had a Duracell battery in mine and it kept dropping to low volts.
