Be careful about borrowing a charging cable

[Clitheroekid]

Sorry if it's been posted before - I don't follow this board - but a chum sent me this recently, and I felt it merited publicising - https://www.fastcompany.com/90413945/th ... hone-cable

[Infrasonic]

You can buy 'condom' adapters that block the data pins on USB leads, allowing charging only (or it's a 30 second DIY job with bits of tape, although USB C might be a bit fiddly...).
https://www.amazon.co.uk/PortaPow-PPSCA ... B00QRRZ2QM

Lightning 'charge only' cables...https://www.amazon.co.uk/PortaPow-Speci ... WWFV0PJ0PZ

[AleisterCrowley]

My elderly iPhone needs a data connection before it will charge via USB, or an intermediate voltage on the data lines

[Infrasonic]

My elderly iPhone needs a data connection before it will charge via USB, or an intermediate voltage on the data lines

I've read recently about laptop OEM's like Dell doing a handshake routine with external PSU's and if it detects a non original it undeclocks the voltage, presumably as a safety feature, or (tinfoil hat) a deliberate performance hit to dissuade buying generic third party accessories...

[AleisterCrowley]

It certainly was the case that iPhones etc wouldn't charge if connected to a USB charger with floating data lines. If they can't do a handshake/negotiation they look for fixed 'non logic level' voltages on the data lines. From memory 2V on both denoted a low power charger and 2V on one and 2.8V on t'other was a >1A jobbie