Battery Installation Guide – Generic

Battery holes, visualized from side.

Suggestion: remove one of the clasp pins to make the battery change easier and less likely for you to damage the band. Button Cells: The positive(+) side is the flat side with the printing on it, the "nipple" shaped side is negative(-). The picture to the left represents the battery holes/ports.  If there are no markings, there may be a bevel in the bottom corner of the side that requires negative(-) down - see picture to left..  When holes are marked with polarity, that means the side of the battery of that polarity, goes down, against the contact - EXCEPTION IS URANUS modules, READ BELOW!!. Reversing the polarity, even for a fraction of a second, will generally kill your module permanently...the infamous, "cell reversal damage". 🙁
Uranus modules.  Uranus modules do not have a bevel in the bottom of either of the battery holes and are marked adjacent to each hole on the plastic of the module (some have no markings),  + by one, - by the other.  This means the +(positive) side should be UP in the hole marked +. This is contrary to all other manufacturers (that I am aware of).....I wonder how many Uranus watches have been killed by improper insertion.
Larger batteries  A,AA,AAA,C,D,N are polarized the opposite of button cells - the protruding "nipple" end is the positive/+ side. Please be careful when loading batteries into vintage equipment.  If there is a spring contact and a flat contact presenting themselves, put the spring contact in contact with the negative(non-nippled) end of the larger batteries A-N..

Other polarity clues:

  • Largest contact is positive(+). 
  • A contact on/in side of battery port - negative goes down (see next item).
  •  The side of a button cell is positive(+).
  • Button cells that get stacked(e.g. 2 #386 in some early Benrus and Helbros), go in negative down.
  • LCDs that require two batteries, generally have both negative side down, particularly if both have a side contact.

  • Larger batteries (camera, AAAs and larger),generally positive at "nipple" end.

  • Uranus modules. Uranus modules do not have a bevel in the bottom of either of the battery holes and are marked adjacent to each hole on the plastic of the module (some have no markings),  + by one, - by the other.  This means the +(positive) side should be UP in the hole marked +. This is contrary to other manufacturers.

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