What voltage is 40% of a 3.7V 18650 cell?

LED Flashlights – General Info 18650 Flashlights
1

I’ll need to store 18650 batteries over the summer. What voltage is roughly equivalent to 40% charge with an 18650 cell?

Thanks

2

2.5-2.7V + 40% = 3.4-3.6V

3

Thanks!

4

Depends on the brand and model have a look here:
https://budgetlightforum.com/t/-/56246
Or on HJK reviews
Nice name BTW :)

5

Docware did a test on several cells by discharging in 5% steps of the previously tested capacity at 2A and measuring the voltage after a rest of 20min :

6

as far as battery storage voltage, just keep it at 3.7v and you’ll be fine, 38% or 42% makes no difference

7

Yes, when the battery is not used for a long time or used for long-distance transportation, keep it at around 3.7V. For more easy operation, XTAR VC8 charger with storing mode can charge and discharge the battery to its rated voltage, to maximize the battery lifespan and save energy.

More details: XTAR VC8 8-Bay Battery Charger & Capacity Tester