Many older devices or batteries still only tolerate 0.5A via micro USB. Does this charger realise this and adjust the charging current or does it deliver the full current of 3A?

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Hello, the unit first sets a charging current of 0.48A when it is switched on. If it detects after approx. 1s that the current can be boosted (depending on the unit), then it does so.

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yes, this should actually be adapted: "...dedicated AiPower technology with 2.4A charging output detects the power needs of connected devices and efficiently matches the output power to safely charge any of your USB devices." according to the product description
i have been using this product daily for a few years now and i am still satisfied with it.

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Question about Aukey Titan PA-T11

Many older devices or batteries still only tolerate 0.5A via micro USB. Does this charger realise this and adjust the charging current or does it deliver the full current of 3A?