Etymotic MP•9-15 Music•PRO® Electronic - Manual (Page 8)

Batteries
8
Zinc-Air Batteries
Use commonly-available #10 zinc-air hearing
aid batteries. They are easy to find in pharmacies,
online, and at various retail locations.
• Zinc-air batteries have a long shelf life, but once
the tab is removed, battery life is about 9 days for
continuous operation.
• Battery life is about 2 weeks if the devices are
turned off after each use.
• Once the tab is removed, zinc-air batteries may
self-discharge in about 4 weeks whether used
or not.
• The discharge rate varies with temperature
and humidity.
• It is sometimes possible to prolong the life of
a battery by replacing the tab over the air holes,
but results vary.