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These work in all of the female ports that I have tried so I’m not sure what the fuss about length is all about. My guess is those guys wired theirs wrong and are blaming their failure on the length. Note that the two wires are black and white which would typically correspond to positive and negative respectively. But black goes to the outer contact and white goes to the center. The center inner contact is usually positive. I’m glad I checked with my continuity tester.
Like a person before me stated, the size advertised is 5.5.mm x 2.5mm. However, the real size is 5.5mm x 2.1mm. This will not fit into the power port I am using. If a 5.5.mm x 2.1mm is what you need, then this may work for you. I will not return and just keep on hand for other projects.
The listing says: 2.5mm but the product is actually 2.1mm. The package actually ALSO said 2.5mm but the connectors themselves inside are 2.1. I used metric drill bits to verify: 2.mm could be inserted, 2.5mm could not.