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Today a short, but (hopefully!) Helpful everyday tip that I found out by chance: If your battery charger reports that it cannot recognize a battery or thinks that it is defective, then that doesn't mean that he's really dead. I had this experience at least yesterday when I took three batteries out of an LED night light with a motion detector in order to charge them. Since the night light has not been on for a long time, the batteries had probably been discharged beyond their pain threshold for a long time - which should actually be avoided. But it happened anyway because every time I walked past the LED night light, I was too lazy to change the batteries.
Defect: The battery is no longer recognized
So I have the batteries in mine TECHNOline BC700 Charger (which I can highly recommend!) clamped and looked what happens. With two of the three AAA rechargeable batteries (type NiMH) he started charging immediately and with the third it was only permanently "ZERO". Which means, "I have no idea what you stuck in there, but that doesn't appear to be a battery. I'm not loading that!“. Don't be surprised: In the photo below, instead of the three AAA batteries, I only have two AA and the affected AAA battery in the device, because I've tried something else in the meantime.
My first thought was: Oh crap, the battery was still relatively new (3-4 charge cycles) and I broke it. After a few desperate attempts to get the device to charge, I gave up briefly. After a few minutes, however, I fell into mine cool USB battery charger (the Olight UC) that I still had in a box. I thought I would give it another chance and attached the defective battery to this device as well. Unfortunately, the status message that the battery cannot be charged also came up here - indicated by the red LED flashing briefly. Nevertheless I had it hanging on the Olight UC for 3 to 4 minutes because I had been looking for something in the meantime.
But not so dead: a quick summons helps!
When I came back, the status message was still unchanged, so I unplugged the battery and - actually just out of spite - clamped it into the BC700 charger again. Lo and behold: it suddenly recognized the battery and started charging it! Eureka!
Since I had another AA battery that was not recognized by the BC700 either, I tried the same game again. The BC700 reported "ZERO" again. In the Olight UC, the defective battery was also acknowledged with the status message "Error". After five minutes I put the battery back into the BC700 and lo and behold: it was charged. There seems to be a system behind it! :D
My attempt to explain
The only way I can explain it is that the batteries that are not recognized have too little residual voltage. The Olight UC will - even if it reports an error - send a certain current into the battery, which ensures that it is charged a little. This charging raises the voltage of the battery to such an extent that it is sufficient for the "right" charger to recognize the battery again.
Jens has been running the blog since 2012. He appears as Sir Apfelot for his readers and helps them with problems of a technical nature. In his free time he drives electric unicycles, takes photos (preferably with his iPhone, of course), climbs around in the Hessian mountains or hikes with the family. His articles deal with Apple products, news from the world of drones or solutions for current bugs.
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