Why does a newly replaced battery bulge?

[OTucker]

Battery bulging is mainly caused by insufficient electrolyte inside the battery, leading to prolonged charging when the charger fails to switch off. If the battery depletion is due to quality issues, and the battery is still under warranty with proper vehicle maintenance, a free replacement claim can be made. Automotive battery warranty period: Generally, the warranty period for automotive batteries is one year or 20,000 kilometers. Since batteries are considered wear-and-tear parts, their warranty period is relatively short. Battery warranty regulations: Car owners can refer to the vehicle's three-guarantee manual, which clearly stipulates the battery warranty period. During the warranty period, if issues such as broken battery plates, short circuits, leakage, or bulging occur and are confirmed by professional technicians as quality problems, the battery can be replaced free of charge at the designated purchase point, usually without any additional fees.