I have these very cheap but very useful 18650 battery chargers. However, if you accidentally put the battery in backwards, it immediately frys the chip on the charger and lets the smoke out. Someone at one time suggested that I use a fast acting resettable fuse inline between the battery and the charger and ive been looking at them but I don't know what kind of fuse to get.
I was thinking that I could use a variable power supply and connect it backwards to the charger then up the voltage while I monitor the current and see at what point the chip frys ... obviously ill be able to determine how many amps it takes to fry the chip, but since the fuse must be installed in series, I don't know what voltage rating to spec the fuse at ... in fact ... i'm not even sure why fuses have voltage ratings since the voltage drop across the fuse would seem to be a non-issue. I did get some 1 amp fuses or maybe they were 2 amp I cant remember but they didnt do anything ... but I haven't tried my variable voltage test yet either ...
So i'm looking for some advice on how to do this so I don't have to keep guessing.
Thanks,
Mike
I was thinking that I could use a variable power supply and connect it backwards to the charger then up the voltage while I monitor the current and see at what point the chip frys ... obviously ill be able to determine how many amps it takes to fry the chip, but since the fuse must be installed in series, I don't know what voltage rating to spec the fuse at ... in fact ... i'm not even sure why fuses have voltage ratings since the voltage drop across the fuse would seem to be a non-issue. I did get some 1 amp fuses or maybe they were 2 amp I cant remember but they didnt do anything ... but I haven't tried my variable voltage test yet either ...
So i'm looking for some advice on how to do this so I don't have to keep guessing.
Thanks,
Mike
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