How long can sr626sw last?

Three years. According to Casio's data, sr626sw can be used for 3 years. Casio1330/2783/2784/3363/4370/5025/5044/5049/5058 series batteries are all made of SR626SW silver oxide batteries, with a battery life of 3 years. PRINCO smart watch adopts a unique dual-battery design, with built-in quartz watch movement battery SR626SW+ patented lithium battery C-type lithium battery dual-battery, which can be used for one year without charging.