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Silver Oxide (SR) and Alkaline batteries (LR) are commonly used in watches, clocks, timers, calculators, laser pointers, toys, and LED "blinkies". Batteries that meet the IEC 60086-3 standards for watch batteries carry a "W" suffix. The functional differences between silver oxide and alkaline are:

  1. Silver oxide batteries have a 50% - 100% greater capacity, meaning they last up to twice as long as alkaline batteries.
  2. Silver oxide has a relatively slow declining voltage during discharge compared to alkaline, which is preferable for light meters used in cameras and digital calipers. Silver oxide provides 1.55 volts, while alkaline provides 1.5 volts.
  3. Silver oxide batteries have superior leakage resistance, meaning they're more corrosion resistant.

The most common name for this battery is SR66. However, it is also called AG4, SG4, LR66, 177, 376, 377, and SR626SW. All have dimensions of 6.8 mm diameter and 2.6 mm height. Alkaline varieties have mAh from 12-18 and the silver oxide varieties have mAh of 26.

  • Renata 377 Silver Oxide Button Cell Battery
  • Renata 377 Silver Oxide Button Cell Battery Multi Pack 10 Count
  • Energizer 377BPZ Button Cell Battery 2 pack - 377BPZ-2
  • Energizer 377 Button Cell Battery - 377BPZ
  • SONY 377 SR626SW Silver Oxide Watch Battery
  • 10pk Exell EB-SR626 Silver Oxide 1.55V Watch Battery Replaces SR66 377
  • Renata 377 Silver Oxide Button Cell Battery Multi Pack 50 Count
  • Renata 376 Silver Oxide Button Cell Battery
  • MAXELL 377 SR626SW Coin Cell Battery 1pc (Each)
  • Renata 376 Silver Oxide Button Cell Battery Multi Pack 10 Count
  • 377 Silver Oxide Button Cell Battery Multi Pack 100 Count

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