What is the fastest charger for a first generation iPad Pro 12.9?
What is the fastest charger for a first generation iPad Pro 12.9?
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iPad Pro (1st generation)
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Most models of iPad Pro (and other models of iPad) will charge at their maximum supported charging rate when using a USB-C 20W Power Adapter that supports USB PD (Power Delivery).
In more detail, most models of iPad require a Power Adapter rated at 12W (i.e., 2.4A @5V) or greater to reliably charge. 5W Power Adapters (1.0A @5V) intended for older models of iPhone are inadequate to charge an iPad; if the iPad charges at all, charging will be very slow. Recent models of iPad are supplied with a 20W USB-C Power Adapter.
Some third-party USB-C power adapters (and portable PowerBanks) may not support USB PD (Power Delivery). Power Delivery mutually negotiates the charging voltage; the source, load and cable are all elements involved in the negotiation protocol. Unless the Power Adapter explicitly supports USB PD, it will almost certainly fail to charge the iPad; proprietary charging standards, such as QC (Quick Charge), are not supported.