I have 3 phones using these batteries, one of which is dead and not charging anymore, one was fully charged and one just went to zero. I replaced the dead battery with one of these new ones and charged both phones until the next morning. Both were fully charged. I left both unused and after 3 days the old battery had to be recharged but the new one was still fully charged. Of course the old battery is older and this may not be a completely fair test but it was the only test I was able to do. Four days later, the new battery still holds a charge, and the audio is excellent even when using hands-free. The original batteries are 400 mAh, and this is 600 mAh. So far, so good. I will buy again.
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