How to Change Batteries for a Uwatec Aladin Nitrox Computer

Written by mark slingo
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How to Change Batteries for a Uwatec Aladin Nitrox Computer
Dive computers are used by divers to monitor depth, time and remaining allowable bottom time. (divers image by Paul Wright from

Aladin Prime and Aladin Tec are dive computers manufactured by Uwatec. They incorporate nitrox functions to enable them to be used for dive planning with nitrox, which enables the diver to plan longer bottom times. The battery in the computers is user-replaceable, with the battery compartment located on the rear of the device. You have to take care to prevent leaks and avoid damaging the components of the computer.

Skill level:

Things you need

  • Scubapro universal tool (or coin)

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  1. 1

    Dry the Aladin Dive Computer with a soft towel, then turn the battery cap on the base of the computer counter-clockwise. Use a coin or the Scubapro universal tool. Remove the cap when it's loose.

  2. 2

    Remove the o-ring carefully, taking care not to damage the sealing surface of the computer.

  3. 3

    Lift the battery out of the computer--avoid touching the contacts as you remove the battery. Place the new battery into the battery slot in the computer, with the "+" sign pointing outwards.

  4. 4

    Replace the o-ring in the o-ring groove. Before inserting it, ensure that the o-ring has no dents in it and that the o-ring, o-ring groove, and the sealing surfaces are free of dust and dirt.

  5. 5

    Push down the battery cap firmly. Turn it clockwise until the marking circles on the cap and the computer are aligned. Do not force the cap beyond the circles, as this can break it and void the warranty. After battery replacement the Aladin will perform an 8-second test and give a beeping sound when the test is done.

Tips and warnings

  • Always change the battery in a dry environment to prevent water from entering the battery compartment.
  • Do not use lubricants on the o-ring, as the can react with the battery causing malfunctions.
  • Changing the battery will clear all physiological data from the computer, meaning it cannot calculate correctly for a repetitive dive. If the computer has desaturation time left on it, then you must not dive again with the computer for at least 24 hours as the computer will treat the dive as if it is not a repetitive dive and make no account for dives already done--which can lead to serious injury or death from decompression sickness.

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