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Linking drill batteries in series? Answered

i've been watching this video of a guy building a portable speaker powered with cordless drill batteries and i'd like to do the same for my project but my amp requires 30 to 36v. At around the 1 minute mark the video shows how he linked his battery up and i was wondering could 2 of those usb adapters be connected in series to allow 2 18v batteries to be linked together for 36v?

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