Only have time to test one so far as I only got them yesterday but the one I tested rated my windows tablet very well at 1.7A charged the special 3s2p 18650 package that I made. The tiny regulator chip feels quite warm but might be ok for silicon, haven't tested the actual temperature yet. I haven't had the coil squeak I usually hear from USB boost converters. So far I'm happy with it, especially for the price.
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