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This temperature increase signifies more than just discomfort; it reflects the internal chemical reactions in the battery accelerating beyond safe limits. Every time a cell heats up, it causes the electrolyte — the liquid that conducts ions inside the battery — to evaporate into gas. The escape of gas elevates internal pressure, which can eventually lead to the rupture or fire of the cell.

The Importance of Proper Charging Equipment

Another critical point raised by the expert is the choice of charging equipment. Using the correct charger, specifically one recommended by the battery manufacturer, is vital to prevent overvoltage and overheating. A mismatched or unreliable charger can deliver inconsistent current, increasing the risk of damaging the battery cells.