The use of gel batteries is a success due to the increased capacity they are capable of. They can handle high current demands, as happens, for example, in cars with tuning processing. The inrush currents at stake are very high, in some cases double or triple compared to conventional lead-acid batteries, the presence of electrolyte in gelatinous form allows mounting the battery even in inclined positions without risking dangerous loss of acid.
This is in addition to greater resistance to the charge and discharge cycles that should not be underestimated. The advantages listed, associated with a maintenance that is limited to the sole maintenance of optimal charge are counterbalanced by prohibitive price lists
There are real (but sometimes inexpensive) cases where it is possible to talk about zero maintenance. What is referred to is the case of gel batteries, in which the electrolyte is no longer in solution but in gelatinous form and hermetic lead batteries.
The advent of new technologies could greatly improve the features, performance and safety of a vital component such as the battery, was known for some time. Interventions can be done by applying a simple adhesive on the body of a common lead-acid battery, to cover the caps for the top-up of the electrolyte, transforming it into a maintenance-free battery.
Except in cases where the battery is sealed without upper caps, for which you can give special attention to the charge only, you can still top up the electrolyte. First of all, it is important to operate in a ventilated environment away from sparks and open flames because the gases that could escape are inflammable.
Also, remember that the electrolyte is composed of sulfuric acid which, although in low concentration, is corrosive, so it is good practice to protect eyes with transparent plastic glasses and wear protective gloves.
On car battery replacement always take note that after removing the battery from the car and not before loading it (if necessary), lift any stickers covering the closing caps. Unscrew with a screwdriver (or depending on the models, lift lever) the caps on the battery cover corresponding to each element.
If the liquid level is low and the battery plates are uncovered, add distilled water until the level is restored to a possible reference mark or a few millimeters above the plates;
reassemble the caps and reset the stickers, where possible.
24 Hour Car Battery Service experts do not recommend inserting foreign substances, acids, bases or household products inside the battery in order to try to revive an exhausted battery. Such products could trigger dangerous chemical reactions or speed up the normal deterioration of the conductive material.