DC Power Supply Battery Connector Squid--with iPhone 12
This cable set comes with adapters for iPhone 6, iPhone 6+ and the 6+ also fits the 6s and 6s+ and SE. It also has a proper 7, 7p, 8, 8p, X/XS/XSMax/XR, and 11/11Pro/11ProMax, also 12/12PRO/12PROMAX/12 mini connector so you can work on all modern iphones with one cable.
The convenience can't be beat for using your DC power supply to troubleshoot "no power on" problems in iPhones. Connect the cable to your DC power supply, set the voltage to battery voltage, and then use the right adapter on this cable to connect to your device. Once you prompt to boot you can see if your device is consuming high current (i.e. short circuit), low current (i.e. dead chip/bad data line), or shows the normal signature current consumption 'heartbeat' of a device that is alive.