The effects of an overcharge are easily recognizable by visual inspection. Among main aspects that we can see include:
* Yellowish labels indicating that an intense increase of temperature occurred.
* Very low electrolite level after short usage of battery (in all vases). In free maintenance batteries it is possible to check liquid level by the display installed on the lid.
* Expulsion of electrolyte through valves of battery or covers if there is access to the electrolite.
* Battrey with stuffed container.
In systems with 24 Volts (two 12 Volt batteries interconnected in series), if there is a 12 Volt equipment connected to one of the batteries, the battery will discharge as charge is required. This phenomenon occurs due to the electric imbalance between tensions in the battery, whereas the tension regulator considers total sum of tensions and not each one individually. Therefore, if one battery is 15 Volts and the other one 13 Volts, total sum is 28Volts. The system will be in balance with the regulator and it will not allow circulation of current between the batteries. By doing this one battery will kept charged while the other will be discharged.