Need Really Good Batteries for Flash

Here you can find typical discharge curves for batteries: https://www.powerstrea​m.com/AA-tests.htm
There you can see that typically alkalines drop below 1.2 V after about 25% of used capacity. This depends on the required current to operate the unit - but alkalines only provide 1.5 V for a very short time. For typical low draw situations, NiMH are keeping the 1.2 V reliably for quite a while. This means that NiMH generally perform better and provide a higher voltage for a longer time compared with alkalines - or you only using a fraction of the alkalines capacity. NiMH rechargable are NOT "lower-output".
Not sure what this means for the YNs? But if it really is so demanding on voltage, then the voltage reduced li-ion might be indeed a good solution.

The battery-god thread:

https://photography-on-the.net …/showthread.php​?t=1477069

Angmo wrote in post #18542990
The battery-god thread:

https://photography-on-the.net …/showthread.php​?t=1477069

That is a good read but doesn't mention these new USB rechargeable 1.5V Lithium Ion AA batteries.

I am currently using the white Eneloops, but I frequently swap them out and recharge them because I worry about mis-fires due to the low 1.2V starting voltage. I don't want to use non-rechargeable 1.5V Alkalines as they tend to drop their voltage too.

From what I have read these USB rechargeable 1.5V Lithium Ion AA batteries maintain 1.5V for a long time. That seems ideal for a low draw device that needs 3V (2x 1.5V) to operate at full efficiency.