How old are you?
Even a chimpanzee can Google search "26650 button top batteries" and find several different brands of button top 26650 batteries instantly and very easily.
From your post it sounds like you are very young like 8 or 9 years old, have little knowledge/education about lasers or even common sense if you can't find a battery on the entire internet lol, and probably should not have/own/use a laser.
If you do not know proper safe laser operating procedures and have knowledge of laser safety you will just be "an accident looking for a place to happen".
Powerful laser pointers are not toys, they are dangerous devices that can blind you in less the 1/4 of a second which is the amount of time the human blink reflex requires to close you eyelids.
Eye damage from a laser hit to the eye occurs much faster than that--so fast there is nothing you can do to prevent or correct for it >>>
you need to be wearing laser goggles before you turn the laser on.
Most importantly, more important than finding batteries which any child can do on goggle very easily, is to buy a pair of good laser goggles which are a must for using the laser you bought or you risk permanent eye damage.
Study up on laser pointer safety before you damage your eyes or the eyes of others. See best laser safety web site here:
https://www.laserpointersafety.com/
Buy a good quality relatively low cost Eagle Pair of laser goggles and avoid any cheaper garbage quality laser goggles that are all over eBay and most offshore suppliers. See Eagle Pairs here :
https://www.survivallaserusa.com/Safety_Goggles/cat1667093_1527285.aspx
See and read about what happened to one member in less than one second while using a 1W/1000mW 445nm blue laser:
https://laserpointerforums.com/threads/hit-in-eye-with-1000mw-445nm-blue-laser.69469/
Importantly also see:
https://laserpointerforums.com/thre...checklist-be-aware-of-your-environment.97407/
