A new battery easily lasts a year and longer. Most of them let out a chirp when the battery needs replacing. Or you can just change it once a year whether it needs replacing or not.
1. goggles are needed to protect eyes from UV lite if used 2. gloves are needed to protect our hands from any type of burnings or during handling of hot substances and glasswares 3.Lab coat is needed to protect our body and clothes from chemicals 4. i think visor and .Safety screen are used fro protecting our face during welding when sparks are produced. 5. fume board is genreally used to avoid the escape of the fumes or bees or any other such stuff
