How do you change the battery in a series 3100 luminex navy seal

If any battery operated watch starts losing time or displaying the incorrect time, this is usually indicative of a battery going bad and needing replacement. My Luminox 3100 started lagging in time and I noticed that the second hand would intermittently stop. I also have a Suunto Vector (Digital) wrist-top computer and the times along with the compass, altimeter, light and alarms all started to act crazy and all it happened to be was the battery being run down. Coincidentally the Suunto has a battery gage that only appears and flashes during low battery charge.
BL: Try the simplest thing first, change your battery. Please be very careful not to break the O-ring on any watch that's waterproof/resistant as this will render the protection useless. Also if your watch is still under a manufacturer or vendor's additional warranty, get them to change it as not to void your warranty. 'Hope this helps!

mcdevito75 here, BEST BET for your Navy Seal watch, look for a small watch repair shop in your area for this part.

It may be that the battery is running low. Have you had the watch for some time?

(Other watches use a similar behaviour to indicate low battery).

there's really no way to adjust this problem...unless the watch has been severly jarred or damaged in some way it is most likely just a low or dead battery..if it has been damaged only a watchmaker would be able to replace the faulty gears or parts

take it to a reputable jeweler who can water test after the cell is replaced...if the gasket gets damaged with the caseback off the watch it will no longer be water resistant and will most definately rust if exposed to water

The date may be off by 12 hours.  This would cause it to change at noon, and not change at midnight.
 Try forwarding the time or reversing the time 12 hours in the correct direction.

It is a feature of this watch, it is referred to as the end of life (EOL) feature, it is a way of letting you know its time to change the battery before it dies to the point where it cannot keep time anymore

parsecent.com...they have all the parts to fix it with and they also have to band-to-case piece that you've lost

Sounds like there could be a bit of foreign material floating about inside, or the new battery was not up to scratch. Take it back for checking.

If you dial in the date before noon make sure you stop winding the crown right after the date flips. That will give the internal mechanism the most room to cycle and not flip at noon. If you are setting it after noon wind the crown just until the date you want starts to move to the following date, but stop immediately after so as to not flip over. That way the mechanism will be close to changing the date and should flip it at midnight. Make sense? Hopefully, good luck.