I drained by accident my car's battery. When I connect it now to a multimeter it shows 3V. I connected the battery already to a trickle charger and I would like to know for how long I should charge it, so that I don't damage it by overcharging. E.g. can I measure with my multimeter a voltage or current level reached and then know that I have to stop the charging? Also, can I use my multimeter to calculate in advance the charging time? Tnx

Quantities I know:

• The trickle charger's output is 13.0V and 0.3A (to be precise my multimeter display shows 0.3 when I set it to "10A DC" and it shows 3.0 when I set it to "200mA")
• the dead car battery showed 3.0V before charging
• the battery has a capacity of 60Ah