When it comes to replacing your cordless phone batteries, here are a couple of things to keep in mind. First of all, it’s critical that you buy replacements that are compatible with your handset. Replace the batteries with new ones that have a similar or higher load rating. Give your new batteries a good initial charge. Dispose of your old batteries in an environmentally safe way.
Cordless batteries come in several different types, so you need to verify you are buying compatible replacements. Some of these different types include nickel-metal hydride (NiMH), lithium, nickel cadmium (ni-cad), and lead acid. Replacing a battery with the wrong type could lead to dangerous damage of your cordless phone headset. At a minimum, using the wrong batteries won’t fix the problem.
You’ll also need to make sure the batteries are rated similarly. Buying a battery with a lower rating than the one you’re replacing will lead to quicker discharges and in general a poorer performance. However, it is possible to upgrade the battery to a higher rating if you stick with the same charging technology. This could actually give you extra minutes of talk time and extra days of idle time.
Once you install your new batteries, leave the handset charging in the base for at least 24 hours. This initial charge will help extend the life of the battery later on. You may have heard of a memory effect when it comes to battery charging. Not all batteries are the same; some are more susceptible to this than others. In general, it is a good idea to use your handset until the batteries become low and then put the handset in the base until they’re fully charged again.
One final note: when you’re throwing the old batteries away, make sure you follow your local community’s rules for recycling. Some types of batteries represent a risk to the environment.

When buying Cellphone Batteries make sure that you are not getting those chinese fakes and knockoffs.,..