Are lasers safer with rechargeable batteries?

I wonder what the best and easiest way to lower a laser's power output is? I have used an ND filter earlier, but it is not without issues.
Could I simply switch to rechargeable batteries in stead of alkalines? They have 20% lower voltage after all.
And how well does my ND filter work in reality? Like specified? I will also demonstrate how to test the strength of an unlabelled, mystery filter.

ND8 filter donated earlier by https://www.wickedlasers.com for their show laser, like I use it in my video on divergence:    • Bad Beams? | How divergent are lasers?  

My Patreon-page:   / brainiac75  
Measuring my strongest lasers:    • Strongest LASERs in my collection | P...  
Measuring laser divergence:    • Bad Beams? | How divergent are lasers?  
Building my beam dump:    • Don't use strong lasers without this ...  
Laser classes explained:    • Even STRONGER Garden Laser?!? | Laser...  

Did you miss one of my videos?:    / brainiac75  

FULL MUSIC CREDITS
Time codes: 0:01 + 8:20
"Darkness is Coming" Kevin MacLeod (incompetech.com)
ISRC: USUAN1100584
(edited to be loopable by me)

Time codes: 0:45 + 4:52 + 9:01
"Luminous Rain" Kevin MacLeod (incompetech.com)
ISRC: USUAN1100169

Time code: 1:23
"Redletter" Kevin MacLeod (incompetech.com)
ISRC: USUAN1100714

Time code: 1:50
"Clear Waters" Kevin MacLeod (incompetech.com)
ISRC: USUAN1100290

Time codes: 3:24 + 7:49
"Darkening Developments" Kevin MacLeod (incompetech.com)
ISRC: USUAN1100267

Time code: 5:26
"Neo Western" Kevin MacLeod (incompetech.com)
ISRC: USUAN1100615

Time code: 6:30
"Perspectives" Kevin MacLeod (incompetech.com)
ISRC: USUAN1300027

All music above licensed under Creative Commons: By Attribution 3.0 License
http://creativecommons.org/licenses/b...

Time code: 7:05
Mix of two tracks:
1) The Shimmering by fran_ky (freesound.org/s/237363)
Licensed under Creative Commons 0 license
2) "Spacial Harvest" Kevin MacLeod (incompetech.com)
Licensed under Creative Commons: By Attribution 3.0 License
http://creativecommons.org/licenses/b...
ISRC: USUAN1100653

#LowerPower #Laser #Brainiac75