Introduction To Lead-Acid Battery Chargers

A lead-acid battery is an electrochemical device that stores and releases electrical energy through a reversible electrochemical reaction. Its core components include lead alloy plates, dilute sulfuric acid electrolyte, separators, and an acid-resistant casing. The charging and discharging process is based on the conversion between lead sulfate and active materials: during charging, the external current causes lead sulfate at the anode to convert to lead dioxide (PbO₂), and at the cathode, lead sulfate is reduced to spongy lead (Pb), while the sulfuric acid concentration in the electrolyte increases. During discharging, the reverse reaction occurs, producing lead sulfate at both electrodes and reducing the electrolyte concentration.

Battery performance is closely related to the plate design. Using a glass fiber tubular anode reduces active material shedding, and a gel separator prevents short circuits between electrodes. During use, distilled water should be added regularly to maintain the electrolyte specific gravity, and the charge capacity should be estimated by measuring the specific gravity. Routine maintenance should avoid overcharging or deep discharging. When the battery is not in use for extended periods, the negative terminal should be disconnected and the electrodes kept clean. Abnormal electrolyte concentration may indicate battery malfunction, requiring timely inspection or replacement.