In this step, you will solder the battery leads to the solder pads on the logic board.
Excess amounts of heat transferred to the logic board while soldering may result in permanent electronic component damage. As a rule of thumb, only hold the tip of the soldering iron against the joint just long enough to melt the solder, then quickly remove it.
Solder the connection by momentarily placing the tip of the soldering iron against the connection, pressing solder into the connection (melting it), and quickly removing both the solder and the tip of the soldering iron from the connection. The solder should flow around the new battery lead, solidly connecting it to the pad on the logic board.
Solder the other two battery leads in the same fashion, taking special care not to bridge any of the connections together with solder.
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