Are all 9 volt batteries the same?

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  1. #however
  2. #battery
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  4. #energizer
  5. #standards
  6. #batteries
  7. #small
  8. #duracell
  9. #industrial
  10. #brand
  11. #these
  12. #there
  13. #allow
  14. #varying
  15. #still
  16. #differences
  17. #unfortunately