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[EMD]

No big deal that the battery went flat but it took nearly 24hrs to recover it  Is there anything other than the power sounder that can drain the battery while the car is not being used 

[Diamond Black Geezer]

Sorry it falls into the 'blindingly obvious' category, but have you checked the silly things like rear reading lights - these can so easily get flicked on, and no-one notice. Perhaps then something like a failed courtesy switch on the puddle lights/boot light, maybe? other than that, I'm out of ideas 

[EMD]

Will have to check when the battery gets put back on . There was a brake light warning coming up together with headlamp warning when i last drove it  Wonder if its a bad connection to do with that 

[Bigron]

EMD, no surprise that it took that long to charge fully from dead flat; if your charger has an output capability of2 Ams, which is fairly common and your battery has a capacity of 60 Ampere-hours (can be greater....), then time to get back to full charge is 60/2 = 30 hours.
So, you must have discharged the battery completely - how long did it take to flatten it, i.e. last time it was used?
If it emptied in a day from being fully charged, you need to look for a current drain of similar proportions - around 2 amps or more.
You should be able to find that sort of drain fairly easily?

Ron.

[EMD]

EMD, no surprise that it took that long to charge fully from dead flat; if your charger has an output capability of2 Ams, which is fairly common and your battery has a capacity of 60 Ampere-hours (can be greater....), then time to get back to full charge is 60/2 = 30 hours.
So, you must have discharged the battery completely - how long did it take to flatten it, i.e. last time it was used?
If it emptied in a day from being fully charged, you need to look for a current drain of similar proportions - around 2 amps or more.
You should be able to find that sort of drain fairly easily?

Ron.

I last drove the car 3 weeks ago and since then only started it once and had the doors open quite a bit ron . No idea what capacity the charger charges at but its one of those optimate for motorcycles  Its meant for keeping the battery topped up over winter when the bikes laid up and charges too but its done the job 

[Bigron]

I think you have answered it; 3 weeks without use apart from a current-draining start and no miles in which to charge the battery via the alternator, together with a noticeable drain from interior lights due to having open doors - it went flat!
I doubt that you need to go seeking an untoward current drain and your charger is probably a bit lightweigt if it is intended for motorcycle/maintaining charge use.
If you can arrange to have the charger connected to the battery in situ all the time, it will bulk charge the battery and then drop back to a trickle-charge rate when full, so that your battery is always fully charged and ready for use without being overvharged, if your charger is of the "smart" type as you seem to have described.
The only caveat I have is if it's a pulsed-output charger; then you would need to disconnect one terminal of the battery because the Omega's electronics won't like the pulsing, and sulk - or worse!

Ron.

[Webby the Bear]

What Ron said.

If you think you may have a drain though youtube 'eric the car guy - parasitic draw'. You basically connect your multimeter in circuit and then pull fuses. When amps drop you've found your drain. Then fix.