![Amazon.com: Casio Illuminator 10-Year Battery Extra Long Strap 100 M Water Resistance 5-Alarm w/Countdown Timer Men's Digital Watch, Green, AE-1500WHX-3AVCF : Clothing, Shoes & Jewelry Amazon.com: Casio Illuminator 10-Year Battery Extra Long Strap 100 M Water Resistance 5-Alarm w/Countdown Timer Men's Digital Watch, Green, AE-1500WHX-3AVCF : Clothing, Shoes & Jewelry](https://m.media-amazon.com/images/I/71+dXGAzy3L._AC_UY900_.jpg)
Amazon.com: Casio Illuminator 10-Year Battery Extra Long Strap 100 M Water Resistance 5-Alarm w/Countdown Timer Men's Digital Watch, Green, AE-1500WHX-3AVCF : Clothing, Shoes & Jewelry
![My brother's watch lasted a decade on the original battery, and these batteries are tiny, so I'm just wondering.... how long with a big enough battery could one last? : r/casio My brother's watch lasted a decade on the original battery, and these batteries are tiny, so I'm just wondering.... how long with a big enough battery could one last? : r/casio](https://preview.redd.it/zzadwac6xie61.jpg?width=640&crop=smart&auto=webp&s=e884b68a72f7306165c286389c066e24de3d48bc)
My brother's watch lasted a decade on the original battery, and these batteries are tiny, so I'm just wondering.... how long with a big enough battery could one last? : r/casio
![Casio watch. Had it for ~20yrs. It died today but I just replaced the battery and it's back again! I had only changed batteries twice: 10 yrs ago and today. Truly BIFL Casio watch. Had it for ~20yrs. It died today but I just replaced the battery and it's back again! I had only changed batteries twice: 10 yrs ago and today. Truly BIFL](https://preview.redd.it/df7p5fv0muz71.jpg?width=640&crop=smart&auto=webp&s=51662dfbe2d72819a20254eb2a2cf29360785fa1)
Casio watch. Had it for ~20yrs. It died today but I just replaced the battery and it's back again! I had only changed batteries twice: 10 yrs ago and today. Truly BIFL
![Kitosun CR1220 3V Lithium Button Cell Batteries - Premium CR 1220 Lithium Cell Button Battery Replacement for G Shock Casio Watch Watch Canon PowerShot Christmas LED Necklace Magnifier: Amazon.de: Electronics & Photo Kitosun CR1220 3V Lithium Button Cell Batteries - Premium CR 1220 Lithium Cell Button Battery Replacement for G Shock Casio Watch Watch Canon PowerShot Christmas LED Necklace Magnifier: Amazon.de: Electronics & Photo](https://m.media-amazon.com/images/I/61pYWNh4FAL.jpg)