Yes, it is soldered to the motherboard using a heat tunnel that solders all components on to the motherboard. SN63 solder is the typical solder that is used on all those surface mountable devices including this ML1220 rtc clock battery that is made by Sanyo, FDK and Maxell for Toshiba for their Toshiba A300 & A305 motherboard. The battery in itself has two welded tabs for the positive and negative polarities. The negative pole is positioned up while the positive side of the battery and it's welded tab is facing the motherboard. The positive tab is in a horizontal plane, extruded outwards, while the negative tab folds over the pvc collar and then bent 90 degree before it too is in a horizontal axis. Then those two printed tabs will have each of the tabs connected by this solder flow. You could use other brands as the person said above, so long as the onboard charging circuit will replenish the voltage to the battery when the battery has drained.