EEVblog Electronics Community Forum
General => General Technical Chat => Topic started by: Homer J Simpson on November 27, 2016, 12:33:07 am
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https://www.youtube.com/watch?v=hWmy-MWRZZc (https://www.youtube.com/watch?v=hWmy-MWRZZc)
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In general, the Ah capacity of batteries sold from China are not worth the plastic they are printed on. The vendors/manufacturers lie so they can get you to click on buying theirs over some other fraudster's batteries.
Best to buy genuine Sanyo Eneloop or genuine Panasonics. Problem is the Chinese are so good at pirating the genuine article you cannot tell the difference from the outside. This is particularly the case with mobile and cordless phone replacement batteries. There are many "Genuine" Samsung batteries (complete with barcode or hologram) that are just fakes, imported from China and sold locally via eBay. If you want to eliminate the risk, buy from a reputable dealer in your country, not from eBay.
Most of the torches sold on eBay from China are also rubbish. They don't last very long. Best to pay more for a reputable brand from a reputable retailer.
Years ago retail stores sold boom boxes (AM/FM cassette stereos you carted on your shoulder) that boasted "20,000 mW of Peak Power!". One I saw stated something like "1,000,000 uW power output" on a cheap no-name cassette stereo! They were marketing to the ignorant masses. The manufacturers did not lie, just exploited non-technical people by making the numbers look good. With the 9900 mAh batteries they not only marketing to the ignorant masses, they are straight out lying.
In the end you get what you pay for.
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Problem is the Chinese are so good at pirating the genuine article you cannot tell the difference from the outside.
Because people in other countries are not as vigilant and hence easier to scam. In China, we can spot it is a fake easily, at least I can spot most fake or mislabeled things at a single glance.
One business model in China is to scam old people since they are not as tech savvy as young people, while being more wealth and having more ego and stubbornness, so they are perfect target to scam.
For example, in this case, these kind of AD are designed to target mid aged people with a hobby of collecting outdoor gears. They know little about electronics, while are willing to pay for the "biggest number", and they are stubborn that they won't admit they screwed up and bought a fake. Therefore, even knowing being scammed, they won't bitch the seller and even recommend to other people.
Scam a Chinese young, tech savvy person? Very hard.
Scam ANY tech savvy person and it is difficult. Old technology illiterate people are vulnerable in ANY country.
But some people will fall for anything. This woman who lives a few suburbs away paid $5,000 in iTunes vouchers to the "tax department" who had an Indian accent. She demonstrates unbelievable stupidity and gullibility. But on the other hand, she was brave enough to show her face to warn others of the scam.
https://au.news.yahoo.com/vic/a/31556330/grandmother-conned-5000-in-itunes-vouchers-in-australian-taxation-office-scam/#page1 (https://au.news.yahoo.com/vic/a/31556330/grandmother-conned-5000-in-itunes-vouchers-in-australian-taxation-office-scam/#page1)
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Funnily enough I was just watching this:
https://youtu.be/Y_TFiA05tcc?t=1m18s
Apparently exaggerated claims are not restricted only to no-name items...
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3100mAh for an 18650 cell is normal, and three of them gets you 10.8V/11.1V depending if you define them as 3.6V or 3.7V.
The highest capacity battery out there available to the general public is 3350mAh 3.85V Panasonic one, and if they build a battery pack with them, they can legitimately claim 3350mAh (or 3400mAh) 11.55V.
Well, I am not sure I could agree 3100 mAh is "normal", since that would imply it is common and typical for such batteries, which I am not sure is the case. 3100 mAh seems to be pushing the upper limit of what's possible.
However, from the way David talks about it ("it is actually about 2.6 Ah or so") I have the impression he has actually measured the capacity and is not just guessing (in the same segment he says the battery life is about 1.75 hours, and I assume he knows the power consumption of his camera).