My saber has a recharge port and I'm using a dual-cell 7.4v 18650 setup (this one from TCSS). I own an Anker Astro portable battery to charge my cell phone on-the-go, I'm sure it uses the same batteries on the inside and it has two USB ports that output up to 3A, but the output is 5v. Can I safely make a cable that adapts USB to 2.1mm DC plug? Or will it damage either/both the components and catch on fire?
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