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Cleaning the solder joints
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Now that the battery is removed, you have to desolder the remaining parts of the battery terminals.
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After that, you have to clean the solder joints where the two terminals of the battery were soldered onto.
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For cleaning the solder joints and to remove the remaining solder, you can use a desoldering pump or a solder wick.
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If you have excess flux residue on the PCB, you can clean it with isopropyl alcohol.
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