Step 1/
First find out the chemistry of your old phone battery. This is usually Nickel Cadmium or Nickel hydride. The Nickel Cadmium type were used in many of the older phones and these have now been replaced with Nickel Hydride.

Step 2/
Find out the size or your phones rechargeable battery most are 2/3AA size and many now are 2/3 AAA as the phone are getting smaller. Most of the older type phones used the standard AA size. You could look here to see many other sizes to check
http://www.espspecialbatteries.co.uk/index.htm

Step3/
Once you have selected which batteries you need you must purchase them with solder tags fitted. There are many sites that will supply and again all sizes can be found at http://www.espspecialbatteries.co.uk/index.htm

Step 4/
Having got your batteries you now need to solder link the tags in series i.e. Positive to negative leaving one tag for your positive connection and one for your negative.

Step 5/
You now need to fit your connector most of these can be found at http://www.espspecialbatteries.co.uk/index.htm

Step 6/
Now solder the red positive lead of your connector to the positive solder tag on your newly made battery pack. Then solder the black negative lead to the remaining negative end of your battery.

Step 7/
Finally if you have some heat shrink sleeving then cover your new battery and using a heat gun shrink it down so it fit tightly over the battery pack. Alternatively you could get away with using insulation tape, but this is not as neat.

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