I can't answer the question about battery durability or service life because I just received the batteries. I have a set of 3 phones and all 3 need new batteries. They worked perfectly and were very easy to install on any phone. I ordered 3 sets of 2 and only received 2 sets of 2. Now Revain has to resend a set of 2. I will also be ordering 2 more sets of 2 to have a full replacement for each phone if needed.
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