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Cordless phone batteries can have a life span of up to three years. Depending on whether the battery type is alkaline, nickel cadmium, nickel metal hydride or lithium-ion you can recharge your battery 200 to 700 times before needing a replacement. In order for your cordless phone battery to have a long life span it is best to let the battery completely discharge and cool off before recharging.
Source:
Batteries Direct.com: Batteryopedia
ePanorama.net: Battery information and circuits
NeedBattery.com: How to get best of your cordless phone battery?
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