It could be a bad cell. A 12V battery comprises six cells which are nominally 2.0V each. If a cell has a partial internal short, it can self-discharge in a few hours. If this gets worse, the cell can act like a dead short-circuit, effectively making the battery into a 10V battery. Although the alternator will force it to the normal charge voltage of 14.4V, this is at the cost of generating large amounts of hydrogen which can cause an explosion if ignited. This can spray acid all over the place so is not to be recommended!
I've seen shorted cells on a couple of batteries in the past two months. Here's what I'd do. Disconnect the earth lead, so the battery has no load on it, and charge the battery fully using a charger. When full it should float at around 14.4V while drawing very little current. If there's still a lot of current or the voltage never reaches this level, you have a dead short. But if the battery seems to have charged, leave it to stand off-charge for 24 hours and measure the voltage. I would expect to see around 12.5V or higher. If it's 11V or less you probably have a shorted cell and the battery should be replaced, as it's a danger.
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