This study aims to evaluate the impact of laboratory test conditions on the float charging life of VRLA batteries at elevated temperatures. Comparative test was conducted between two test environments: a water bath and a drying oven,focusing on battery lifespan and water loss under standardized temperature conditions.Results indicate that batteries tested in the drying oven exhibited a significantly shorter lifespan(more than 30% reduction) and higher water loss(1-3 times more) compared to those in the water bath. This highlights the necessity of stricter humidity control in current applicable industry standards(e.g.,IEC,IEEE,DIN) to ensure laboratory data validity for real-world applications. Future studies should explore optimized humidity thresholds and validate test protocols using temperature & humidity Chambers with dual environmental controls.