Cordless phone battery
The usual life of a cordless phone battery is 2 to 3 years with the normal use of the phone. Generally the typical batteries used are Ni-Cd, NiMH, and Ni-Ion.
Ni-Cd cordless phone batteries:
The Ni-Cd batteries are prone to develop memory effect, which may be reduced by putting the battery through several charge and discharge cycles, making sure that the battery has been discharged completely each time it is charged. In order to discharge the battery, the phone may be left out off the base till the phone is completely dead, and then put back on its charging base. You would need to do this couple of times before your cordless phone battery gets fully charged. The other types of batteries, NiMH and Ni-Ion, do not have memory effect.
NiMH cordless phone batteries:
NiMH batteries function better than the Ni-Cd cells. They do not have the memory effect and has a much lower rate of discharge compared to Ni-Cd, resulting in the battery to last longer before recharge. In other respects, both the batteries are the same. You would need to refer to the manual that came along with your phone to find out if NiMH batteries could be used in your phone. The phone and your charging unit may get damaged if you use NiMH batteries, where the phone has not been designed for using such batteries. The manufacturer's manual would provide you with information relating to the batteries that you can use with your cordless phone. In case you are using NiMH batteries, you should follow the same charging and discharging cycle as you do in case of Ni-Cd batteries.
Li-Ion cordless phone batteries:
If you choose to use Li-Ion cordless phone batteries, there are certain specific advantages that they provide. They are much lighter than the other versions, and also are smaller in size. Here again you will need to refer to the manufacturer's manual to find out if your phone has been designed for Ni-Ion cordless phone batteries. Li-Ion holds a greater amount of energy compared to the other two, and this provides the battery with higher energy density. This would mean that the battery lasts longer before you need to recharge it again. The disadvantage is that Li-Ion batteries start to lose 5% of their charge per month as soon as it is made. Further, Li-Ion batteries cannot be discharged completely as you can do with others. If discharged completely, the battery cells get damaged beyond recovery. While the battery discharges, you need to be careful as not to let the battery discharge completely.
Charging The Battery For The First Time:
In new condition, cordless phone batteries are not in a charged condition. Charging the batteries for the first time requires long charging time, with some types requiring 12 to 15 hours to be fully charged, while the others get charged in 5 to 6 hours. When you put the cordless phone battery to charge, a red light on the base of your cordless phone will light up, indicating that the battery is charging. After the battery gets fully charged, you will need to remove the phone from its base and let the battery discharge completely, after which the phone should be put back on its base for recharging.
While charging you will find that the battery charger is getting warm. When you charge multiple sets of batteries, you should rest the charger for 30 minutes before you put it on charging your batteries again. This will provide the charger with time to cool off its components.
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