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VARTA POWER on Demand hearing aid batteries, 312/PR41 1.45V in a blister pack of 60 batteries. Cell dimensions: 7.9 mm diameter/3.6 mm height Compact, high-performance hearing aid battery for daily use with a guaranteed shelf life of 4 years Packed in practical, resealable packaging with secured, two-layer blister card for added security Up to 40 hours of additional battery life for your hearing aid compared to the IEC 60086-2 Ed. 14.0 hearing aid standard test MAD. Performance may vary depending on use.