Amazon has a special problem. They call it "binning".
Most folks are unaware that when multiple vendors sell "the same" item on Amazon, Amazon takes the items from all of them and stores them in ONE BIN at each warehouse. So if you buy a popular brand name charger that is available from ten vendors, you have no way to tell which vendor actually supplied the item.
Amazon has very quietly conceded that they are aware some vendors are supplying COUNTERFEIT GOODS and that binning makes it impossible to tell which goods are counterfeit. So before anyone says the battery vendor supplied counterfeits...There's apparently no way to tell who the actual supplier was, when the goods came from a shared bin on Amazon.
Amazon's lack of public comment on many issues (scammers, counterfeits, etc.) may eventually come back to bite them. This has been going on for several years, with no publicity from Amazon about the issues or solutions at all. FWIW.
I've been tempted to do all my charging in a Dutch oven with the lid on, just in case. Except of course, I can't find one big enough for the cell phone and laptop.(G) I have made a point to add a fire detector on the wall above the area where these things are usually recharging at night though.
Another unpublicized safety item: Ionization type smoke detectors (all the cheap ones) have a working life of 7-10 years, and then a build-up of simple dust and crud from the air usually kills them. They just stop working and don't go off--as I learned after a fire. If you are using a fire detector, please, even if you really do test it from time to time (not the battery test button, but an actual smoke test) THROW IT OUT when it is ten years old. The new ones come with a ten-year battery, making them cheaper to replace than they are to feed batteries.
Very often even display identical voltage on my DMM. All is needed -- same manufacturer, same batch.
