“What are the actual dimensions of the 390/389 battery? diameter and thickness ?”

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• The 390/380 battery is 7/16 x 1/8

  Answered by Dino 6 years ago

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• 1/2" round and 1/8" thick

  Answered by Millie 7 years ago

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• Not to avoid the question, but since battery numbering seems to change periodically, the best bet is to consult online equivalency charts and/or find a vendor (e.g., Robinson Hardware - Ace - in Guilderland) with a display that allows you to plug your old battery into a slot that matches diameter and thickness - and be sure to match voltage.

  Answered by GregSpidey 7 years ago

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