Home telephone batteries
Since the relative demise of the corded phone, batteries have become an essential part of any landline. Whilst most (if not all) cordless phones will have rechargeable batteries, even these can become damaged or deteriorate over time. In this case, you may need a replacement.
It's important to know and understand the battery type when buying a new battery so you get the right one. Alternatively, you can find the phones manufacturer and model number to make life easier.Battery type
There are three main types of batteries to be aware of for most cordless phones; Nickel Cadmium, Nick Metal Hydride and Lithium-Ion. Remember the battery type will be specific to your phone, so make sure you find out which battery your phone uses before purchasing.
Nickel Cadmium (NiCd) is the oldest version, but are known for having the longest shelf life and are durable. These batteries tend to lose their storage over time, especially when they are recharged before being completely empty of power or left on charge when the batteries are full.
Metal Hydride (NiMh) don't need to be recharged as frequently because of the density the battery is made so will last between 200 to 300 cycles. There is no memory effect with NiMh batteries and can be recharged at any point without losing power.
Finally, Lithium-Ion batteries have typically 50% more energy density than any other types of batteries and can be recharged without having to wait till they are completely empty. These batteries will last for a few years before needing to be completely replaced.Replacing The Battery
The cordless phone battery should be replaced when you notice the power is getting low more frequently than usual or when it's taking longer to charge than when you first charged it. That way you don't leave it until the battery has completely died before you get a replacement. There is a range of brands available on the eBay such as Panasonic or Uniden, so make sure you pick one that matches your cordless phone.