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Solder the battery connector
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Press the soldering iron tip against the circuit board's solder pad and the battery connector's lead for a few seconds to heat them both. Angle the tip so it has maximum contact with the pad and lead.
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Feed the solder wire into the heated area until there's a concave pool ("mini volcano") of solder surrounding the lead.
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Remove the solder wire first, then remove the soldering iron from the pad.
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Repeat this process for the other battery connector lead.
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