They came into our AT&T phones. They lasted 2 years but $10 for 4 is cheap. They died, of course, from being left in their charging cradle 24/7, just like any cordless home phone. I don't know how it compares to others. Update: The second batch I ordered took less than a year. I think this may be because they may be from the same batch I bought over 2 years ago. So I upgraded life to 0 to 2 years
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