Flat battery - I'd accidentally left one of those wireless OBD things in the socket for 2 weeks is the suspected cause. Nothing from the car - not even an interior light, and had to open the door with the key.
Connected the battery to an Aldi AutoXS CPL-2054 smart charger - read
4.5V. It's now been on charge for 18 hours, and is only reading 8V. According the the manual the charger won't move from this pulse mode until the voltage gets over 10.5V.How long should I expect to keep the charger going like this? I do have a 'dumb' charger - is it worth putting that on to move things along? Or might the battery be spent?