Ten 391/SR1120W Energizer Watch Batteries. This is a new set of 10 type 391 (SR1120W) Energizer batteries. There are 5 batteries in a package. ENERGIZER - trusted power for proven performance and reliability. Brand new & guaranteed factory fresh. The shelf life on Energizer batteries is 5 to 10 years. These batteries are commonly required for Swatch, Fossil, Timex and Casio. Energizer's reported failure rate is far less than 1/1000 of 1%. This devotion to consistent quality has led it to control over 70% of market share in Switzerland, one of the world's leading watch producing countries. Energizer is respected world wide for its uncompromising quality and consistent performance. Energizer's technological leadership produces a variety of miniature batteries which are trusted for use by the best names in watch, computer, keyless entry, consumer electronics and hearing aid industries.