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Smatree Power Bank Charger
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<blockquote data-quote="Virtual1" data-source="post: 22006" data-attributes="member: 4084"><p>They've clearly got some "brains" in there with the power cycling required after a short. But those generic 8 pin sop chips that they appear to be using for buck/boost aren't smart at all so it'd require a microcontroller at the least to manage that and especially the thermistor. I'm going to assume it has the mechanism of preventing some overload conditions, especially after seeing the overheat shutdown. Now it all comes down to whether or not they have the circuitry necessary to detect the overloads suggested, and whether or not they did a good job programming the MCU to identify and respond properly in those cases. So yes, it's definitely possible, but that doesn't mean they pulled it off properly. Think of things like cases where a car was designed poorly such that the airbags wouldn't deploy in certain types of collisions where they should have. The sensors, airbags, and computer were all there but something wasn't done right that could lead to a failure.</p><p></p><p>So it may not be possible even when looking over a product to determine if it's going to behave correctly in given circumstances. Often it has to come down to beta-testing, or responding to customer complaints. Sometimes whoever they have manufacturing the product just has a rare quality control issue where one worker on the line on rare occasion makes a critical mistake, and that leads to rare but catastrophic failures. Those are difficult to predict and can be difficult to identify the cause for to get the process fixed. Or it can come down to a part that has a high doa-behaves-dangerous number, and that can come down to needing better pre-packaging testing. A lot of products nowadays seem to get thrown together, turned on, and if the power light turns green they toss it in the box and ship it.</p><p></p><p>My <em>personal take</em> on this so far is that the two reviews we saw are genuine problems people experienced, and that the retailer is in denial that there is <em>any possibly</em> that there could ever be a problem. (or damage control, or a combination of the two) It's very hard to design a bulletproof product, and with something that deals with this much energy you can get some <strong>very</strong> spectacular failures. (just look at those <em>hoverboards!</em>) Plus we're all a lot more likely to hear about one failure than about 100 successes, because people tend to only make noise when things aren't going their way. So I try to keep all of this in mind when I read a negative review, that for every 1 positive review I read, there are probably dozens of satisfied customers that just didn't post a review. And that provides some perspective when looking at 2 negative reviews among a pool of dozens of positive reviews.</p><p></p><p>(and since you have people trying to game the system on <em>both</em> sides, you can't take any of it too seriously)</p></blockquote><p></p>
[QUOTE="Virtual1, post: 22006, member: 4084"] They've clearly got some "brains" in there with the power cycling required after a short. But those generic 8 pin sop chips that they appear to be using for buck/boost aren't smart at all so it'd require a microcontroller at the least to manage that and especially the thermistor. I'm going to assume it has the mechanism of preventing some overload conditions, especially after seeing the overheat shutdown. Now it all comes down to whether or not they have the circuitry necessary to detect the overloads suggested, and whether or not they did a good job programming the MCU to identify and respond properly in those cases. So yes, it's definitely possible, but that doesn't mean they pulled it off properly. Think of things like cases where a car was designed poorly such that the airbags wouldn't deploy in certain types of collisions where they should have. The sensors, airbags, and computer were all there but something wasn't done right that could lead to a failure. So it may not be possible even when looking over a product to determine if it's going to behave correctly in given circumstances. Often it has to come down to beta-testing, or responding to customer complaints. Sometimes whoever they have manufacturing the product just has a rare quality control issue where one worker on the line on rare occasion makes a critical mistake, and that leads to rare but catastrophic failures. Those are difficult to predict and can be difficult to identify the cause for to get the process fixed. Or it can come down to a part that has a high doa-behaves-dangerous number, and that can come down to needing better pre-packaging testing. A lot of products nowadays seem to get thrown together, turned on, and if the power light turns green they toss it in the box and ship it. My [I]personal take[/I] on this so far is that the two reviews we saw are genuine problems people experienced, and that the retailer is in denial that there is [I]any possibly[/I] that there could ever be a problem. (or damage control, or a combination of the two) It's very hard to design a bulletproof product, and with something that deals with this much energy you can get some [B]very[/B] spectacular failures. (just look at those [I]hoverboards![/I]) Plus we're all a lot more likely to hear about one failure than about 100 successes, because people tend to only make noise when things aren't going their way. So I try to keep all of this in mind when I read a negative review, that for every 1 positive review I read, there are probably dozens of satisfied customers that just didn't post a review. And that provides some perspective when looking at 2 negative reviews among a pool of dozens of positive reviews. (and since you have people trying to game the system on [I]both[/I] sides, you can't take any of it too seriously) [/QUOTE]
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