Alternative to primary lithium for infrequently used lights?
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For known prolonged storage without much use, I try to only use lights with multiple cells for slower overall drain, and I check or maintenance charge them every 1-3 months depending on use. And I keep the charge at around 4 volts (not the max 4,2V).
Alkaline cells are a big no-no for me (been there, leaked that more than once...), so now it's only 18650 or 21700 cells for me. Something with good capacity, and preferably a simple light with no memory / parasitic drain.
Alkaline cells are a big no-no for me (been there, leaked that more than once...), so now it's only 18650 or 21700 cells for me. Something with good capacity, and preferably a simple light with no memory / parasitic drain.
Do any power banks/flashlights exist with constant current, voltage point cut off? That is, current set based on battery size, but simply shuts off at set set voltage and omit the saturation charge?
Whatever it is that they use in power bank production line to charge them to shipment charge level.
Whatever it is that they use in power bank production line to charge them to shipment charge level.
I don't know any models off-hand, but many lights are voltage regulated, with protected batteries also having a low-voltage cut-off level.
A typical 18650 or 21700 cell with a PCB will stop working at around 2.8 V (I am no expert on this). At which point the light will no longer turn on.
As for chargers, my Nitecore UMS4 has a manually set cut-off charge voltage, though I haven't used that feature yet. I just remove the cells when they have reached the charging voltage I want, or topped off if they are going into a frequently used light.
A typical 18650 or 21700 cell with a PCB will stop working at around 2.8 V (I am no expert on this). At which point the light will no longer turn on.
As for chargers, my Nitecore UMS4 has a manually set cut-off charge voltage, though I haven't used that feature yet. I just remove the cells when they have reached the charging voltage I want, or topped off if they are going into a frequently used light.
This, preferably CR123s.
