[cobrin]

Yeah three ways to go from here, first is to go to a battery shop and have a free battery scan done on yours you should get a report or evidence of the results. You'll know if it requires a simple charging, or the capacity is below threshold to save and thus require replacing.

Second, buy a battery charger and charge the battery, things should be back to normal, however you still don't know what capacity is left in the battery (see why a battery report is the way to go), so you might be up for another battery 12/18mths from now. At least you have a battery charger and can do top up charges monthly as a preventative maintenance behaviour, till it simply isn't reliable enough, at least that'll give you time till you need to buy another.

Third, buy a new battery and things should be normal.

Every time the battery warning came up on the dash, the wife always caused it. Left the key in the ignition on pos1 overnight is the main cause, others simply because she'd still be on a phone call over BT in the car every day for 10/20mins after shutdown. Lastly short drives to work and back with no weekend or monthly drive to stretch its legs.