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thanks for the reply and adding some knowledge
I think all of the 150mA cables are very old, one is branded Sony Ericsson so it's probably from a phone I had in 2010.
The cable that came with the RavPower should be fairly good quality, I think the problem lies firmly with the Cinq5's design and the built in current limiter / cut off circuit.
moog
Would be interested to know the origin/brand of the different cables.
Usb-c has communication between devices and only pass an agreed current between them. 150mA is the USB3.0 unit load specification so that cable is not to spec and is only allowing the minimum current to pass.
900ma is the USB3.0 high speed limit so there is some sort of communication happening. The 1.5A appears to be handshaking the devices properly as it's allowing the proper USB-C current to pass. This is the cable I would trust with a £500 smart phone.
I'd spend £10 on a decent cable from a reputable brand before binning the cinq and buying new. (Or buy new and post me the cinq to play about with)