Question about AT&T E2125 (650530003738) Cordless Phone

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ATT E2125 Cordless Answering System with Caller ID/Call Waiting

The phone started giving a warning check battery message whenever the phone rang. I decided to replace the battery, but the phone does not recognize replacement batteries -- just dead, not even a check battery warning. The phone will still recognize the original battery, but it doesn't hold charge for very long (even if it sits in the cradle all day). 
When you put replacement batteries in the phone and place it in the cradle to charge, you hear a periodic popping noise. I figured that the contacts in the phone or on the cradle might be dirty and not making a connection, so I tried cleaning the contacts with a q-tip and rubbing alcohol, but this didn't seem to fix the problem.
I also tried the recommendation on the ATT support website of unplugging the phone and removing the battery for 5 minutes and trying again. This seemed stupid, and it didn't work.

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