Hi all, I just replaced two Li-ion 18650 batteries in my rechargeable fan and one of them started smoking vigorously and the spring contact went glowing red. The originals were in parallel but I installed the new ones in series. Whilst I accept my stupidity and ignorance, shouldn't there be some sort of protection in place?
You see, in the photo you posted, that there's a label stating, "If it is not working properly, contact a qualified electrician or service centre for examination and repair.
Never try to dismantle it by yourself".....?
Does the manual give instructions on how to replace the batteries and with what type you should replace them?
If not then, as the label says, you shouldn't be doing it.
They've told you not to do it. That's probably protection enough, legally speaking.
ok
But would a 5V input be enough to charge 2 X 18650 batteries
Can you post pics of the original batteries?
There are various devices using 18650s that charge off a 5v USB. Those that support 2A charging (as stated on this device) are generally favoured.
It's not as fast as using an external battery charger, but it's relatively reliable.