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When I saw this powerbank I had to get it, purely because it was so thin. I did another test on its performance and it barely manages to put out 1A at 4V before cutting out, so probably better suited to lower loads, but not too low or it goes into standby. This makes its use as a powerbank a bit limited. On a plus note, the unit came with a decent charge already in it, probably because of its low load standby function. I'd rather it had been the simpler type that puts out 5V all the time and just keeps it topped up to meet demand. That would make it useful for powering very low loads like lights. It does have full secondary battery protection that doesn't rely on the boost chip. If you enjoy these videos you can help support the channel with a dollar for coffee, cookies and random gadgets for disassembly at:- http://www.bigclive.com/coffee.htm This also keeps the channel independent of YouTube's advertising algorithms allowing it to be a bit more dangerous and naughty.
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A deadly dangerous USB charger (fake Apple iPhone charger) from China. Sold on Ebay for 90 cents including shipping. The PCB board has only 1mm distance between primary and secondary side. The EMI capacitor between primary and secondary side is only rated 1kV (should be Y1 class with a test voltage of 8kV). The transformer isolation is also questionable. The power supply has no fuse (just mains-bridge-electrolyte!). This poses serious risk of fire. When the power transistor shorts out (and it is likely to do so, because there's no snubber network), the primary of the switching transistor gets essentially connected to mains with no fusing. This is likely to cause a meltdown of the transformer and get mains to the output. An explosive test has demonstrated this :). Never try to do this experiment. Never use this device. Extreme danger. Video includes 2 explosions and 2x tripped breaker. You can support me on Patreon: https://www.patreon.com/DiodeGoneWild
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