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Have you ever put your phone on the charger at night, only to find it won't turn on the following morning? If you've had that battery for over a year, it may be time for cell phone battery replacement. Check your cell phone user/equipment guide to see if the manufacturer lists a lifespan for your particular battery. If the manual confirms your battery is near the end, you have your answer.
If you can't get an answer from the cell phone user/equipment guide, there is a very handy Internet guide at http://reviews.cnet.com/4520-11288_7-6634891-1.html. This CNet.com guide lists cell phone battery lifespan information for most major brands. It's handy for troubleshooting your old battery, and also for figuring out when your cell phone battery replacement will itself need replacing.