Hi Dencol,
Try disconnecting the battery, leaving it for a couple of days, and seeing if it has still gone flatt. If it does, and with there being no possible chance of an external item draining the charge, it must be a faulty battery.
If this is due purly to age and/or sulphation of the plates (this is usually caused by the battery being allowed to go flat) I suggest you use Halfords battery pills.These remove the sulphation and restore the effectivness of the battery.
I have used these myself many times over the years and can vouch for their effectivness. Bear in mind however that they can not work if the problem is caused by loose or buckled plates, or some other mechanical failure.
I hope this may be of some help.
Wilbury
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