In order to perform the Makita, Bosh, or Milwaukee 18V battery rebuilding, you may need a 4-in-1 screwdriver, new cells, melt glue gun, special soldering iron, and spring clamps. Take the battery packs and remove the screws that keep them together, don’t forget to yank the top off and measure one of the cells. You should place the new elements (cells) on a table and stow them according to the required polarity (use the old pack as an example). Glue them together. Don’t forget to clamp a heat sink onto the tabs just before you expose them to high temperatures (it will protect the battery). Perform the tabs soldering along of the rosin-core solder. Do the same with the additional rows of cells. Take the old battery temperature sensors/insulators and endure them to the plastic body frame. The boiling of an electrolyte is one more problem. After determining the failed cells, the person has to cut the connecting plates and dismantle the required elements. Then, a hole should be made in the jar body and filled with distilled water. The final part is a jar sealing and connecting the element to the existing circuit.