How do I change batteries on a M.Z. Berger AW 213 watch
I know it's been a while since you posted this question, but I just had to do this with mine after it was lost in a drawer for a few years, and I had no luck googling so I had to figure it out for myself.
First, you have to remove the band, but you only need to do this on one end, not both. I did this by twisting the watch body around while holding the cloth/leather portion of the band still, letting the elastic part twist around with the watch body. Then, just use a fingernail to pull on the ridges on one end of one of the pins that are holding the band on; both ends are spring-loaded, so it doesn't matter which. Twist the watch body back around, and you'll now be able to flip it over to expose the back.
Now, take a thin, strong blade (I used a butterknife) and pry off the back plate. There's a tab on the upper right edge of the back plate to make this much easier. Since it probably came off in the process, place the rubber sealant ring back around the edge of the backplate.
Once you have the back plate off, there's a thin metal piece covering the battery that's held on with one screw. Remove that with an eyeglass screwdriver or any other similarly-sized Phillips-head screwdriver. There's just a small tab holding the metal piece in place on the other side, so just flip the metal piece up a bit and pull it out. You can now take the battery (a CR2016 3-volt watch battery) right out.
But wait, what's this? Beneath that battery, separated by a small plastic insert, is another, smaller one, a 377/376 1.55-volt watch battery. The 377/376 powers the analog movement, while the CR2016 powers all the digital stuff and the backlight.
Replace both batteries, making sure to place the plastic insert back on top of the 377/376 before putting the CR2016 back in, and follow the steps in reverse to put the watch back together. You may have some difficulty getting the back plate back on, but I just pressed one side in and held it while I tapped the other side down with my fist.
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