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Once the power is turned off, the auto-start battery path powers the load via the boost circuit. Make sure that the soldering iron used is grounded (and the grounding wire is conductive). It is best to wear anti-static gloves.
When you click on links to various merchants on this site and make a purchase, this can result in this site earning a commission. Affiliate programs and affiliations include, but are not limited to, the eBay Partner Network.