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No, Thunderbolt ports cannot be used to charge pre-USB-C MacBooks. If this were possible, the Apple Thunderbolt Display would surely have shipped with only a single Thunderbolt cable rather than its Thunderbolt + MagSafe hydra:


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Troubleshooting is a process of elimination and often requires patience. In this situation, if you've already reset the SMC (and it may be worth doing again, ensuring you've followed the correct steps for your model), you'd normally want to isolate the different components by testing them separately (e.g. testing the battery in another 2012 MBP, testing ...


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From your description of the problem, my best guess is that the battery needs replacing because it can't hold a charge reliably. That may be your next step to resolution. More serious may be damage to the iPhone circuitry itself from charging problems, drops/shocks, moisture incursion. Accurate HW failure diagnosis is difficult remotely. Somebody needs to ...


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As long as the power bank is a USB standards compliant power bank, then it should not harm your iPad. Note however that even though a power bank or charger might be able to deliver for example 30W (or even more) - it doesn't mean that the iPad will be able to take advantage of that for faster charging. USB-standards compliant power banks and chargers only ...


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You haven't tried checking the power adapter. Power adapters get damaged so before being concerned about the battery. It's best to check wether the power cable is working by either plugging it into another similar MacBook Pro(make sure it's the exact model) or by reaching Apple.


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There's really no option in the iPhone to limit it to charging the battery to 50%, or temporarily disable charging. However, I suggest that you turn the problem around and look at it differently. Namely just stop supplying power to the phone, when you do not want it to charge. You can leave the cable plugged in and have data transfers continually, but just ...


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No, those devices don't work that way. You can only do that with the newer USB-C devices.


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I would suspect something is wrong with the center pin of either your MacBook or your power adapter. In this Apple support document it is described that a missing contact on the center pin may cause the adapter not to charge the computer. This answer elaborates on the pin configuration that is necessary to charge the computer further. As the Apple support ...


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