Question about Casio Atomic-Solar MTG900 Watch

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My MTG900 says, "Charge" on the screen...I got it last Christmas, does this mean I need a new battery?

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CHARGE means you have to charge the watch. It depends on what type of movement you have. If it's solar powered, you need to leave your watch under the light to charge it. If it is battery powered - you haqve to buy the new battery and fit it. Rate me,plz.

Posted on Feb 04, 2010


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Posted on Jan 02, 2017


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Received a watch last Christmas. Have replaced the battery several in this past year???? Last time I replaced....watched & stopped running in last than 2 weeks??

Two things spring to mind.

Most likely is that it needs a lithium battery which are more powerful and have a longer life. Someone is replacing is with a standard silver oxide battery.

It is has a leakage drain fault and needs to go back under warranty.

Dec 05, 2017 | The Watches

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What kind of light should i use to charge my watch

stick the mtg900 in a window sill for a day and that should charge it completely. If that does not work that means you will need a new capacitor. It might be easier at that point to buy a new or pre owned on ebay . they go for like 60 dollars or so.
even though they are solar they still need a battery to store the electricity needed to run the watch. A capacitor will need to be replaced from every 5 to 10 years.

Jan 24, 2012 | Casio Atomic-Solar MTG900 Watch

1 Answer


I am assuming you are reading the battery charge correctly. If so you need a new rechargable battery. Special battery so it is a little expensive. Make sure the person knows it is a "rechargable battery" you want. A regular battery will not work properly or recharge.

Nov 02, 2011 | Casio Atomic-Solar MTG900 Watch

2 Answers

Mtg 900 comes up charge and says recover. What do i need to do? I tried charging it under a lamp for several hours but that does not last long.

I have a watch which is solar type and the instructions say that several hours of sunlight will charge the battery but lamps need much longer (1 -2 days!), my watch now is left in a drawer.

If you haven't got instructions for your watch, to check what Casio recommend, you can get them on the net.

You can get instructions from the Casio web site.

Go to the casio web site "".

Select "support" and the "manuals",

Accept terms

Select "watch manual archive"

Read the number of the back of your watch and enter it into the search box

Apr 05, 2011 | Casio Atomic-Solar MTG900 Watch

1 Answer

Left in window to charge but was gone for 2 months came back and now i have nothing?? what happen?


Apr 01, 2010 | Casio Atomic-Solar MTG900 Watch

1 Answer

I need a manual for the mtg900 in portuguese

If you go to "" you will see the alternative languages available. Unfortunately Portuguese is not listed.

Mar 07, 2010 | Casio Atomic-Solar MTG900 Watch

1 Answer

I have had my MTG900 for about two years. About a month ago I noticed that the blue light would come on by itself. This happened every two or three minutes or so. Now my watch is dead except for the word...

All you need is to find the nearest watch repair shop. Ask them to replace capacitor (in case if your watch is light powered). If it's run on battery - replace by new one. It is very hard to guess what's the MTG900 is. Next time you are here, plz give:Make, model, ALL the writings on case back and every detail you know.

Feb 05, 2010 | Casio Atomic-Solar MTG900 Watch

1 Answer

My Casio MTG900 seems to be dead. How much is a battery and where can it be serviced near Los Angeles?

Thanks all! My G-Shock was only in need of charging in direct sunlight as opposed to indoor lighting.

Nov 01, 2009 | Casio G-Shock MTG900DA-8V Wrist Watch

1 Answer

Setting atomic receiving mode

There are two three-bar displays on this watch.
The three in the top left will always show only one bar (or possibly no bars).  The top left indicates the level of charge in the battery and not the atomic receive function.
The three in the bottom right are related to receiving.  The atomic receive is controlled from settings.  With the time displayed, hold down the ADJUST button for several seconds.  Once the timezone name (e.g. LAX) starts flashing at the top, release the ADJUST button and press MODE once to get to the DST control. Press MODE again to get to the Atomic receive control.  Use the receive button to switch ON->OFF->ON... Press ADJUST twice to exit settings mode.

Nov 02, 2008 | Casio Atomic-Solar MTG900 Watch

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