Do 18650 AW batteries come with a charge already in them? Can I use them before charging them for the first time? Also, is there a way to measure the state of charge by measuring the voltage, or does the voltage stay relatively constant.
It's been a while since I received batteries from AW, but I believe he sends them partially charged, maybe around 3.9v or thereabouts.
You can use them, but ideally give them a top up first.
As for voltage as an indicator of charge, yes, a resting voltage of 4.2v down to 3.7v (or 3.6v, not sure) is a sliding scale of full down to empty.
This is a rough guide though, not an official power gauge.
Is the maximum charging voltage of AW batteries 4.1 or 4.2 volts? I know there are two different types of li-ion batteries that have different maximum charging voltages.
As for voltage as an indicator of charge, yes, a resting voltage of 4.2v down to 3.7v (or 3.6v, not sure) is a sliding scale of full down to empty.
This is a rough guide though, not an official power gauge.
I believe AW li-ions come about 40-50% (~3.8V) based on the ones I have. This is a good level to allow them to be stored for longer before sale with less capacity loss.