The DeWalt 14.4-volt battery is one of a large range of batteries designed for that company's line of more than 200 cordless power tools. It is made from 12 nickel cadmium (NiCad) cells, each producing 1.2 volts to enable the DEWALT DW9057 battery to produce 14.4 volts once wired in. If you find your battery doesn't hold its charge, it's less expensive to rebuild it rather than buy a replacement.
Remove the 14.4-volt DeWalt battery from the power tool and place it on a workbench.
Remove the battery cover using a Phillips head screwdriver to unscrew the six screws. That number may vary depending on the type of battery for DEWALT DW9050.
Use a small screwdriver to pry out each of the12 NiCad cells from their battery compartment. Some are soldered as this provides a better connection and helps stop the cells from shorting. If they're soldered, heat a soldering iron and touch a soldered cell terminal with the soldering iron until the solder melts. Remove the soldering iron and quickly pry the cell away from the connection before the solder hardens. You must do this on all 12 cells.
Place the 12 NiCad cells in a clear plastic bag so they are visible. Dispose of the cells in a DEWALT DW0243 drill battery recycling unit and not in your regular trash.
Insert the replacement NiCad cells into the battery compartment. Either push them in place or, if the old ones were soldered, heat a soldering iron. Touch each cell terminal with the soldering iron and solder. Allow a small amount of solder to melt, then remove the soldering iron and solder and let the solder solidify and cool. Repeat that process on each cell terminal.
Let the battery pack cool. Replace the battery cover but don't tighten the screws with excess force.
Put your battery on charge for an hour to ensure that all the cells are fully charged.
Insert the battery into your power tool.
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