add headphones page

Signed-off-by: Robert Günzler <r@gnzler.io>

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+---
+date: 2025-01-10
+---
+
+# Sony WF-1000 XM3 battery replacement
+
+I've had these since 2021, while they are a bit bulky I am happy with them and
+use them mostly around the city to listen to podcasts and the occasional bit of
+music. 
+
+![](/media/content/sony-wf1000xm3-battery/headphones.jpg)
+
+After they would first slowly show signs of not holding their full charge
+anymore, the batteries completely died on me after some 3 years. I was fully
+prepared to have to throw them out when I learned that the batteries are just
+standard cells and can be easily swapped.
+
+Before you start, get the following:
+
+- CP1254 A3/LIR1254 3.6V batteries
+- plastic spudger
+- (optional) 2 picks
+- phillips head 000 screwdriver
+
+Ok, let's go:
+
+![pry open](/media/content/sony-wf1000xm3-battery/01_pry_open.jpg){class="sm left"}
+![lid off](/media/content/sony-wf1000xm3-battery/02_lid_off.jpg){class="sm right"}
+Use a spudger or ideally two guitar picks and wedge them in to the thin gap
+between the top cover and the base of the earphones. Don't worry about breaking
+anything. As long as the material of your tools is plastic, you won't damage
+anything. This is by far the most tedious step of the process (if you don't
+have the picks). There is a little bit of adhesive behind the lid, so once you
+get the halfs to seperate you might have to widdgle a little.
+
+![screws out](/media/content/sony-wf1000xm3-battery/03_screws_out.jpg){class="sm left"}
+![lift top](/media/content/sony-wf1000xm3-battery/04_lift_top.jpg){class="sm right"}
+With the phillips head remove the two screws that secure the visible part in
+place and then carefully lift it out, flip it over. There is a ribbon cable
+connecting the touch sensor and LED on the top to PCB deeper inside the
+earpiece.
+
+![battery out](/media/content/sony-wf1000xm3-battery/05_battery_out.jpg){class="sm left"}
+To remove the old battery I found it easiest to push the spudger into the
+little gap in the plastic where the ribbon cable connects to the top part. It
+is also glued in; be careful not to pull out the contact points as well. If
+possible try to preserve the glue, it will come in handy when securing the new
+battery in place. I also scraped off what was stuck to the old battery and
+pushed it back into the housing.
+
+![battery in](/media/content/sony-wf1000xm3-battery/06_battery_in.jpg){class="sm right"}
+Before putting in the new battery make sure to check the writing on it or use
+the shape as a reference to figure out which side is the negative pole. Put
+that side down, touching to the contacts.
+The replacement batteries I got where a different brand and had all the
+labeling on the plus pole. While the original VARTA branded batteries had it
+exactly reversed. On my first attempt I didn't pay attention and put them in
+the wrong way around.
+
+![battery comparison](/media/content/sony-wf1000xm3-battery/battery_comparison.jpg)