The service life of 12V valve-regulated sealed lead-acid batteries is significantly affected by operating environment and charge-discharge modes. Under conventional working conditions, their service life is stable. In floating charge standby mode, the service life reaches 3-5 years, making them mainstream for UPS and base station backup power. In cyclic charge-discharge mode, the lifespan is about 2-3 years with 300-500 cycles. High temperature, overcharging, overdischarging and long-term underpowered storage are core causes of battery loss, accelerating plate sulfation and capacity attenuation. High-quality AGM 12V lead-acid batteries have better weather resistance and lower loss, with longer service life under standardized use.