flashlight

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Adair21

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Do all flashlights slowly discharge when not in use? (kbin.social)

submitted 2 years ago by [email protected] to c/flashlight

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I was thinking about buying a wurkkos fc11 as my first flashlight but it said they recommend untwisting it in a review to avoid making a connection so it doesn’t discharge while not in use. Do I need to worry about that with all flashlights? I was planning on keeping it in my backpack so I have it whenever.

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[–] Adair21 7 points 2 years ago (2 children)

To add to this, if you are going to store your Li-ion batteries for any period of time then you should charge them to 3.7v instead of a full charge. This will extend the life of the battery

[–] dmenezes 3 points 2 years ago (2 children)

Good tip, but the OP should be aware that when at 3.7V they have only ~50% charge in them, so remember to also pack a spare or two (at the same voltage) to have the same total runtime.

[–] [email protected] 3 points 2 years ago

Should be closer to 60% but still, it's not in a long term ready state. Long stored batteries should be recharged before use.

[–] [email protected] 3 points 2 years ago* (last edited 2 years ago)

In general, recharging them before use is better - if you're preserving battery life as much as possible the ideal profile is to charge them to ~4.1V, use until ~3.5, then store at 3.6-3.7 until charged for next use, ideally minimising time sitting at full. Going below 3.4ish takes progressively more out of the battery life.

[–] [email protected] 2 points 2 years ago

Worth mentioning that some chargers offer a storage option, charging to exactly 3.7V.

On a charger that doesnt have this, it can be difficult to monitor it closely enough to get that exact voltage.