Drain on the starter battery?

[sirpurrcival]

So not very long ago, I changed the starter battery on my 37' gasser. It didn't seem to be able to hold a charge even though it was only about 2-3 years old. I got a replacement battery and now I am finding that it is going dead after sitting for only a couple of weeks. I'm not sure how to check for a power drain on this battery. The coach batteries seems to be holding their charge and they are way older so I am at a bit of loss.

I have double checked for lights or other things that might be energized like the stereo but so far nothing. It was down to 6Volts today which I know is not good for a 12 volt battery. So flat that I could even get the clicks when I went to start it.

Any thoughts, suggestions?

[Skip426]

3 weeks is a normal draw down time because of the memory draw by the engine module, transmission module and radio memory.
Battery disconnect is one way to prevent if you can't plug in and charge.
Solar charger, will help if stored outside and weather permitting.
Even a single light, left on would draw battery down in 3>4 days, so if the draw takes weeks , 99% sure it's just the memory of those modules.

[Arch Hoagland]

My 2004 W22 Workhorse will run the battery down in two to three weeks.

Monaco puts a battery disconnect switch in the front bay so I just flip it after parking by house where I keep it stored.

So I'd say what you are seeing is normal.