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The charge input is "standard"; if you can find a wall wart with the right plug on the end it will charge the GB40, though it might take a very long time. In general you need a USB-A to micro-USB cord (technically cable) and almost any USB charger.

Bear in mind that if you have a discharged battery and you connect several power sources to it, one after the other, eventually it will be charged.

Since someone asked and I can't find the original, and perhaps not that helpful, answer, the screws on the GB40 (well, mine) are labelled by iFixit as a triangular #2. It's not immediately obvious on iFixit's web site so Noco might have a patent on it, who knows.