Electronics > Beginners

Curious warning printed on a power bank

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janoc:

--- Quote from: amyk on March 26, 2019, 12:37:34 am ---Before you scream your head off about the lack of safety, consider how many of these products are in use, and how many lion cell fires you've heard of...

4.2V was the safe maximum charge voltage for a long time, but in the past few years there have become more common cells with 4.35, 4.4, and now even some 4.5V maximum voltages.

Also look at the typical safety tests which cells are subjected to, in particular overcharging tests: https://www.jameco.com/Jameco/Products/ProdDS/2144243.pdf "Then charge the cell until voltage is 10 V(!) ... No fire, no explosion."

High-power RC lipos are another thing altogether. Those can be deadly even with all the protection.

--- End quote ---

And you believe that the cells that go into crappy products like this, where every single corner has been cut, have been actually tested to this standard? Seriously?  :palm:

They are likely the cheapest piece of crap/rejects that the manufacturer could get somewhere and are probably a risk even if they were charged using a proper charger. That we don't hear about more fires is more likely because the item in question is so poorly built that it dies and is discarded long before the battery will go bang, not because this is somehow OK to do.

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