- Mercury free
- Low drain
- Suitable for watches without backlight and/or alarm.
- Made in Japan.
- Also referred to as 377.

Maxell is the worlds leading manufacturer of Mercury free environmentally friendly watch cells. Silver Oxide cells are the primary long life cells used in quartz wrist watches, where high-energy density per unit volume and a stable operating voltage are required. To mark the distinction between the Mercury Free Silver Oxide batteries and standard Silver Oxide batteries, Maxell have stamped the Mercury Free variant with a Hg 0% design registered logo.