Saw your post w/no replies so I'll try & answer but more importantly give this a bump to see if anyone can really help.
I can only guess that your charger might take many diff. batts. I'm pretty sure there are batts. rated at 3v & the switch would give you the option to lower the voltage so your not over charging which is dangerous.
Have read many times to stay away from any batts. or chargers that have "fire" in the brand name. Must be some bad experiences people have had.
It's probably OK to use it but don't ever leave it unattended. People suggest to place it on a non-combustible surface & or at least use a safe charging bag made to keep it contained if something goes wrong.
Maybe giving more details like the model # or post a pic would be helpful to get some responses. Try a search & see if you can find out about problems with "fire". I based my charger purchase due to all the fire stuff I've seen here.
What equip do you use? Was the charger from a kit?
I have a Trustfire, but after reading the problems others have had I only keep it for a backup. I have TR-001 model and I charged my 18650's and 18350's using the 3.6 setting. Nitecore Intellicharger I4 is the one I use now.
Edit: I forgot to add that I accidentally slid the switch once to the 3.0 volt and it only gave my 18650's a partial charge.
The switch is for the 3 volt lithium batteries they are near the size or the 18350 batteries only there 3 volts instead of 3.6. I have a TR-001 that I have had for about 5 years now not one single issue it fully charges my batteries and turns off when done. I do have an I4 Nitecore as well. However I do most of my charging in my RC chargers as I have a discharge feature and temp monitoring. I can track every thing on my computer and save it to compare to other charges and such, this gives me an idea of how my batteries are doing and if there are any trends developing that would lead to a problem or short life cycle.
Yeah mine doesn't have it as well, but my brothers does depends on where you buy it, some places sell the one with and some without. Just as well most of the 3 volt batteries are used as memory batteries in computers and Laser and light units on firearms as well as some cameras battery number for the 3 volt is CR123 and there are a few other numbers that elude me ATM but they wouldn't be of a bunch of use for vaping IMO
I have a Trustfire TR-001 that I purchased about three years ago. It has no switch and doesn't stop charging completely after the light turns green. I bought a Nitecore Intellicharger i-4 and don't use the TR-001 anymore.
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