Battery charging - any ideas

[YME]

Hi all,
Following the standard 4 year old battery hits winter and won't hold a charge issue, I replaced it with a Bosh 5 year guarantee option from Tayna and that seemed okay for the first month or so (warmer weather) however it's now suffering from exactly the same issue and drops from 12v to 10.5 - 11v after one or two days and sometimes requires a jumpstart especially when very cold outside. The alternator that’s recently been replaced seems okay as its 14.3v when started and it will restart after just a few miles of driving.

I have sent the battery back for testing and it’s looking like they are saying it just needed charging however....

@ Is this a standard claim from a battery supplier (Tayna)?
@ Do Monaro's have any known battery drain issues sticking relays, etc. (I haven’t changed anything electrical)?
@ Does anyone have any other ideas?

Thanks in advance ... Paul

[YME]

Thanks for the responses thus far..

Steve,
It looked like the battery to me as they all seem to have the same issue in the cold (kept outside) after about 4 years, but I take your point as the new one is showing the same issues as the old.
I thought the battery is being charged all the time as it re-charges so quick, is always showing 13 - 14v on the dash and the lights are so bright then started and once the alternator kicks in.

John,
No after market alarm and removed chargers, and Bluetooth attachment etc.

Keep any ideas coming..