14.4v cordless drill...battery does not get a full

Batteries retain a memory. If you only drain the battery half way and than recharge all the time it will only keep half a charge. Try running it all the way down and than recharge it, this can take some time. Let it run till it gets very very slow and almost stops, but don't go past where it stops or it will not take a new charge at all. It does not always work, but worth a try before buying a new one. Good Luck

I don't know how to navigate this forum, but as to batteries not getting up to full charge, I have successfully "repaired" batteries for the Black and Decker cordless drills I have. The answer is one or more cells in the battery are internally shorted.
The methods to fix that problem are here:
http://handymanclub.com/community/forums.aspx?g=posts&t=42166
and here:
http://handymanclub.com/community/forums.aspx?g=posts&t=44094

Read all the posts and pay particular attention to the single cell method I have used.

Cordially,
Gerry

After you have discharged the battery - put in a air tight plastic bag in the freezer for 1/2 an hour - then charge as this drops the temp so it takes longer to get to full charge temp - for tech people with a multimeter :-)
- don't drop battery too far below 0.7 volts per cell as this can also damage the battery cells further (most Ni-Ca batteries are 1.2 volts per cell) - this doesn't work for Li-ion as they can be charged from any charge state