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Step 1
The first thing you'll need to do is remove the old battery from your phone. This normally involves removing a plastic plate from the back of your phone. Normally there are tabs that help guide the plane onto the phone so you need to be careful note to break those. Once the battery is exposed you should be able to just pull it out like a standard AA battery. On some models, there are connector clips that attach to the phone. These should be easy to unlock by manipulating the locking tab.
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Step 2
Now is a good time to write down the model number of the battery so that you can order a new one if you need too. Most online battery stores sell them by the model number of either the battery or the phone itself.
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Step 3
The most important thing to remember about cordless phone batteries is to not just throw them in the trash or in a fire. They can explode and be dangerous to anyone nearby and release harmful toxins into the air. The best way to dispose of the battery itself is to call your local recycling center. They will most likely require you to drop them off yourself at their facility. An easy way to find a recycling center is to go to http://earth911.com/hazardous/rechargeable-batteries/ and put in your zip code. Often times the closest place to drop off your old batteries is a RadioShack or certain participating auto parts stores.
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Step 4
When you bring your battery to be dropped off be sure to put it in a bag of some sort that is dry and does not contain any metal. This protects you from any corrosive build up that has appeared on the battery over time.
