Battery at 10.5 volts!

Hello guys, unfortunately I have a problem which would have been easy to avoid. Had broken my right foot 7 weeks ago and my car only stood around so long. With start then was of course nothing more. So I bridged and then drove 100km highway at 3000 RPM. In addition the engine ran also 1-2h in idle before I then made it out in the evening. Then I measured with Multimeter 11,8 V. The next day it was still 10,5 V. The car started but That day I started it three times. Now it’s today and the battery again shows 10.5 V. Hope it will start right away when I have to work. It’s a Ca/Ca battery from Repstar/Powerblock with 60Ah and 510A. About 4-5 years old. My question now is to save it when I connect it to the charger overnight? So an attempt should at least still be worth it or not? Have just never done something like this and a bit afraid that I don’t have a balcony. And only this charger which also has a Pb mode for lead batteries:http://www.ittgroup.ee/files/IMAX_B6_manual.pdf So in the English forum you say that you can use the charger, see: https://www.rcgroups.com/…/showthread.php?… Thanks for your help, you have to get to work now.