I’m not exactly sure which version is in batch 1, but if it is new enough, it should be possible to check the version by clicking 15 or more times from off. Then it should blink out the build date.
Batch 2, I think, has firmware from 2019-10-02. This simply made the “muggle mode” capable of going one step brighter. It’s a really minor change.
More updates could come later, but they haven’t happened yet.
About the level 65 thing… It is behavior inherited from other lights which use the same firmware. On many of them, the default ramp goes from 1/150 to 130/150, and then there is an additional turbo level at 150/150. When it turns on, it tries to hit 65 because it is visually halfway up and makes a good “medium” mode.
On the lantern, there is no turbo by default. It’s not bright enough for that to make sense. So the ramp goes from 1/150 all the way to 150/150. It still defaults to level 65/150 after a battery change though, since it’s still a pretty good “medium” mode.
It uses the stepped ramp by default though, which goes from 10/150 to 150/150 in 5 steps. Normally I set the default to 7 steps, but that is probably too many for this light. Also, the default floor is slightly above moon because moon is probably too low for most lantern purposes. Also because moon has no tint ramping, and I didn’t want that to confuse people.
On that last point, the number of tint steps available at any given time is related to how bright it is. The resolution gets coarse at the bottom of the ramp because of math. If there is only one unit of brightness, it can be assigned to the warm or cool LEDs, and those are the only two choices. If there are 2 units of brightness, it could be warm=2, cool=2, or a mixture of both (warm=1, cool=1). Then it can get 3 tints. At brightness=3, it can do 4 tints. And so on. It the top, there are 254 different tints. Represented visually, it looks something like this:
So the default floor is high enough to provide 9 different tints, if I recall correctly. And as it gets brighter, the number of possible tints increases.
Anyway, the default after a battery change is level 65/150. If it is in stepped mode though, and there is not a step at exactly that level, it uses the nearest step instead.
Of course, the default brightness after a battery change is unlikely to be something people encounter very often. The lantern never really needs its batteries removed.
Also, if the user turns on manual memory, the saved level overrides the default. So the user can set the default to whatever they want. 65 is only used if the user is in automatic memory mode.
Almost all settings are remembered after a battery change.