Pb-Ca-Sn alloy grids are used in lead-acid batteries, and hydrogen evolution inhibitors are added to the negative plates. The wet charging technology is widely used in the battery industry. After limiting the charging voltage, these batteries can be considered maintenance-free. However, their service life is very dependent on the charging conditions that need to be strictly observed, in particular the limitation of the maximum charging voltage. Battery engineers and producers are looking for ways to recycle into water the H2 and O2 released during battery charging and overcharging. In this way, the problem of water loss can be solved.