These are most commonly used with in-ear monitors like the Phonak line to communicate with a Host on camera. Go with the longest lasting, most dependable ones out there, go with PowerMax. Their 100% mercury free batteries go the distance so that you can too. Their very own EZ turn and lock features makes them incredibly easy to take out of the package and into your hearing aid. 

Features / Specifications:

• Model: 98652
• Manufacturer: PowerMax
• Chemistry: Zinc Air
• Voltage: 1.4 V
• Mercury Free
• 8 batteries per package
• Replaces all Size 10 hearing aid batteries