The "SW" high drain battery is a type of battery that is suitable for applications with continuous, low power consumption and/or occasional high peak currents. These batteries are commonly used in a variety of electronic devices, such as analog and digital watches with extra functions (backlight, alarm), pocket calculators, electronic games, and cameras.

The 348, or SR421SW, is a popular Silver-Oxide cell that is commonly used in watches, with a shelf life of 5+ years. Similarly, the 395, or SR927SW, is another popular Silver-Oxide cell that is also commonly used in watches, with a similar shelf life.

The SR927SW battery has a diameter of 9.5 mm and a height of 2.7 mm. It is also known by a variety of other names, including 1162SO, 1165SO, 280-44, 280-48, 395, 399, 399BP, 543, 610, 613, AG7, D 395, D 399, D395, D395/399, D399, GR927, L926, LA, R 395/25, R 399/35, RW 313, RW 413, RW413, S19, S927SW, SB-AP/DP, SB-BP/EP, SG7, SP395, SP399, SR 57, SR 927 SW, SR 927 W, SR57, SR57H, SR926, SR927, SR927SW, SR927W, SR927W/SW, TR927W, V395, V399, and WMaxel 395 Watch Battery.

The SR927SW is a Silver Oxide single battery with a voltage of 1.55V, which makes it suitable for a wide range of electronic devices that require a reliable and long-lasting power source.

Overall, the "SW" high drain battery is a versatile and widely-used type of battery that is well-suited for applications that require continuous, low power consumption and/or occasional high peak currents, such as those found in various electronic devices.

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