The main task is to fully charge the battery, but recharging is unacceptable. Once again, to comply with all the rules, Experts recommend using an autoloader. In principle, with the question about why the battery gets stuck and how to restore LCO Electrolyte afterwards, Experts understand it. Well, now consider something else.
There are several ways to combat battery freezing. In principle, the most effective and simple: bring the battery during the night in a warm room. Also, if you use the vehicle unevenly and the car is in the street or in an unheated garage, you need to do it. In winter, it is necessary to recharge the battery more often. For example, if the battery has a charge of 70% of its nominal value, it can be recharged. Consequently, the risk of freezing will be kept to a minimum.