Replacing the battery in a Casio Databank 150 watch

[Update February, 2013: It's amazing how things have changed in a few short years. Everyone now uses their phone for all these functions.]

Like many self-respecting technology professionals, I wear a Casio Databank watch. In my case, it's the Databank 150. And when the battery conks out, you'd think that it was time to visit the local jeweler's or K-Mart service desk to get the battery replaced. You can do this, but only do it to watch the look of horror that appears when you hand them the Databank. "Oh, no, we can't service those. You need to send it in to the factory!"

Clearly they have been advised by legal personnel of the ramifications of losing the customer's data.

However, like many self-respecting technology professionals, I don't actually keep any information in my Databank. Those teeny keys are just too small to work with, and it doesn't sync with my computer's address book. What I find handy is the calculator function, which has proven useful on many occasions.

Anyway, you'd think that since the Databank is the choice of so many technology professionals, a quick web search would turn up instructions on how to change the battery. Nope. All we get is this review [2011 update: even that has been removed], with a URL that manages to exceed 256 characters. Note that this guy doesn't keep any information in his Databank either.

Disclaimer: following these instructions may render your watch useless. These instructions may be incorrect. I may be making them up as I go along. I will not be held responsible for you breaking your watch because you followed some instructions someone posted on the internet.

So on with the gory details. Toss aside your warranty, grab your jeweler's screwdriver, and unscrew the four tiny screws on the back. Lift the rear plate off gently so as not to disturb the waterproofing rubber gasket. Oops, too late. Well, do your best to stick it back in on reassembly. Remove the white plastic component protector gently, and you're looking at the battery.

The battery is held in place by a retainer that goes over the battery, heads down, and is kept in place by a plastic catch (see arrow). Unhook the metal retainer by pushing down and out on the retainer with your jeweler's screwdriver, and the retainer will pop loose from over the plastic catch. To clarify: you are unhooking the metal retainer from where the plastic catch is holding it in place. This is a delicate operation; don't push too hard or you'll ruin the retainer. Then remove the CR2016 battery and replace it with a new one.

Here's an ASCII diagram, side view, of the retainer and catch. The plastic catch is the "o".


Or it may just be an ASCII picture of a buffalo.

Reassemble and you're ready to go.

And even though I proudly wear a Casio Databank watch, it does not necessarily mean that I am interested in your watch. I'll say this as politely as I can: I've shared these instructions with you freely. I've posted as much as I know. Please do not contact me to ask questions about Databank watches. Thanks!


Sorry about the mix-up. Clockwise to speed up, counterclockwise to slow down.

I have a question, my casio dbc-150 1477 replace the battery and it takes three months, when it should last up to a year, I can do to have its normal operation ... thanks for your help .. forgive my English do not dominate

Be careful when sliding out the battery on the telememo 30. My battery got stuck on the edge of the two bottom contacts and bent them. I had to disassemble the watch and gently bend the contacts straight again. I recommend that you slip a stiff piece of paper or similar under the battery while pulling it out to prevent the contacts from catching. If you force it like I did then you risk damage.

Even though this is an older post, it came up on the first Google search page for "Casio DBC62 battery".

So I just thought I'd mention, my Casio DBC-62 - which looks very much similar to the 150 - uses a CR1616 battery.

CR1616 is 16mm in diameter, the CR2016 is 20mm.