I have checked many replacement batteries online and found this one specifically designed for my old AT&T phone. I plugged it in and charged the required 16 hours before using it and it works great. I scolded myself for not buying batteries sooner. So far I haven't had any problems with the battery. I bought a set of three just in case one of my other three phones in this home system died of battery (they are all the same age - they are at least ten years old).
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