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Neither held charges for more than a couple days after the first 6 months. I started a comparison test between a Panasonic P-P511 and the Radio Shack equivalent last year. A little over a year later, the Radio Shack battery is completely dead now and the Panasonic battery lasts less than 30 minutes. The Radio Shack guy claimed that theirs lasted much longer. It was a limited test of putting a new one in each of my two phones. Conclusion: Radio Shack's battery is no better than the Panasonic battery. I will try one of the alternatives suggested by other reviewers next.
I purchased this battery as a replacement for the one on my aging cordless phone. It arrived in a timely manner and seems to work fine.
In my experience, the Panasonic brand battery seems to give better battery life than some of the other brands I have tried in my Panasonic cordless phone. But, it does seem to be very important to go through several cycles of full discharge and recharge when you first use these batteries to avoid the "memory" problem that shortens the life of the battery.
The battery lasts a very long time. Sometimes it is left off the charger for a week and it still runs strong.
Don't buy this, I bought it and it died within 12-18 months just like the factory Ni-Cad. Buy the new Ni-MH replacement HHR-P402 it has now lasted me 2 years at least. I didn't have the Ni-MH option when I bought this so I guess I can't fault them for selling it but now the Ni-MH option is here so don't buy this.
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