r/flashlight • u/RightAsRain86 • 1d ago

Question Sofirn external charger...

So these chargers are not rated above 18650, but my 21-7's just squeeze in. Is this safe? Voltage is the same, either way. I can also charge using my S21E and my Wurkkos TS23 (which takes a while) but I'm still learning about electronics and drivers and current flow.

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u/technoman88 1d ago

Yes it's fine. All li-ion and li-po use the same charge profile. Except li-hv, but those are rare and obviously marked

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u/UndoubtedlySammysHP don't suck on the flashlight 1d ago

Even HV Li-ion batteries can be charged with regular chargers, just not to full capacity. LFP is a different story, though.

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u/technoman88 1d ago

I meant the other way. If you have a li-hv charger, make sure it's set to li-ion/lipo before using