Makita manufactures a range of cordless power tools. A Makita 9.6-volt battery pack consists of eight 1.2-volt cells. While battery packs make using power tools much easier and safer than other power options, they can only withstand a certain number of charges and discharges before they start to retain less energy. If you find that your Makita power tool only operates for short periods before needing to be recharged, the cells need replacing. Purchasing a new battery pack can almost be as expensive as a new power tool. Rebuilding a Makita battery pack yourself may take a couple of hours, but it's far less expensive and very rewarding.
Put your Makita 9.6-volt battery pack on a stable work surface. Examine the label to determine the type of cells the battery pack contains. It's clearly marked and says nickel cadmium or (NiCad) or nickel metal hydride (NiMH).
Buy eight NiCad or NiMH cells from your electrical store so you can rebuild your Makita 9.6-volt battery. They are widely available.
Remove the screws holding the cover on the Makita battery pack. They are small Phillips screws so use a suitably sized Phillips screwdriver. There are usually six or eight screws.
Remove the cover to reveal the eight 1.2-volt cells. The cells are soldered in place to ensure a secure connection.
Heat a soldering iron to operating temperature. Place a small flat-head screwdriver nearby. Start at the top of the battery pack and place the end of the soldering iron on the cell terminal until the solder melts. As soon as the solder melts, remove the soldering iron and gently lever the battery out of the battery compartment using the flat-head screwdriver you have nearby. You need to do this quickly before the solder hardens. You may need to practice a couple of times as the timing is important.
Repeat the procedure and remove the eight cells. Turn off the soldering iron. Place the cells in a clear plastic bag so they don't get mixed up with your new cells. Don't dispose of the cells in your regular trash; dispose of them in a battery recycling unit.
Put the eight new cells into the battery compartment. Simply push them into place. Ensure you place them the correct way. The cell terminals are labeled "+" and "-," and the connectors in the battery compartment are also clearly labeled "+" and "-."
Reheat the soldering iron and place the solder nearby. Put the end of the soldering iron and the solder on a cell terminal. It's best to start at the top of the battery pack and work down so you have a system in place. Let a small amount of solder melt so it fuses the cell terminal and the connector together. Remove the soldering iron and solder, and let the solder harden.
Repeat the procedure by letting a small amount of solder melt on each terminal and then letting it harden. Once all the cells are soldered, turn off the soldering iron. Let the battery pack cool.
Replace the battery pack cover. Use a Phillips screwdriver to screw in the screws. Don't over-tighten the screws.
Put your rebuilt Makita 9.6-volt battery in the charging unit and let it charge for a short while, about a half-hour to an hour. This ensures all the new cells are fully and equally charged. Remove the battery from the charger and insert it into your power tool.