I had to leave my 1293 s/c mini with my dad for a while (house works..). I gave him a charger and told him to regularly connect it, which he done some of the time. The car was driven a bit as well, but not much.
I came to get it today, and the charger was connected, but only ready 12.8 volts. The battery is a Halfords HCB013 that was bought new and installed this summer. Its got like a traffic light tester on it, and currently shows "Fully Discharged, Please Re-Charge".
The charger has been on overnight its still showing 12.7 ish volts, and the tester on the battery the same. Is there any way to revive this battery? Its literally less than 6 months old.