Introduction
This guide replaces the charging case battery in case it is damaged or doesn't charge properly. This is indicated by the LED in front of the case not lighting up when the case is opened while not charging, or the LED blinking red when the case should be charging.
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Use one hand to press together the short edges of the case (in the direction of the green arrows). This will create moderate gaps in the top rim on all four sides
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With the other hand, insert a spudger or pick in each of the four gaps, and carefully lever up the inner plastic piece a little bit.
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The clips in each of the four corners (location indicated by the red circles) aren't very tight and should be easy to release.
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I used a metal spudger, but you should prefer a plastic pick as there's less chance of causing damage.
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Once the clips have been released, you can lift out the inner assembly (which has the hinge and lid attached).
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The bottom plastic piece holds the battery and the charging coil and is very loosely clipped to the top, release it and carefully fold it to the side.
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These clips break easily, but that shouldn't be a big problem, as the bottom piece will be held in place by the outer shell later.
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If you're able to, you may want to desolder the copper charging coil wires now, which greatly reduces the chance of further damage. You'll need to resolder them when finished.
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Above the battery is black plastic piece, which is now free. Lift it up and remove it. Make sure to remember the original orientation.
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In case you want to access the underside of the PCB, unscrew the PH 0 screws holding the PCB.
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However this isn't strictly necessary for just replacing the battery. It might give you more room however.
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Note that the magnets attract the small screws, which can be annoying.
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Carefully unplug the battery connector.
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Now the battery is free. Carefully remove it from the bottom of the plastic frame, maybe applying some (moderate!) heat or isopropyl alcohol to loosen the glue if necessary.
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Place the new battery in the same location and reassemble again.
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To reassemble your device, follow these instructions in reverse order.
20 comments
Hello there, I am facing a peculiar issue recently. And I am unsure how to fix it. My WF1000 XM4 case after I got some water in it from the rain, whenever I want to charge it via USB C the case completely shuts down. I opened case, and the disconnected the battery and put in a silica gel bag. And then well, after that I again connected the battery. And the lights went up and it works but I can’t charge it. Whenever I want to charge it, the case shuts down and I have to disconnect and reconnect with the battery to turn it on. The green lights and all everything’s fine. But I can’t seem to recharge it. So, my question is, would a battery replacement be enough to fix it or do I have to replace the whole case?
Does it charge the headphones with the battery disconnected while connected to USB C?
I suspect the problem to be on the PCB in your case. You could try to clean any corrosion with isopropanol. Especially around the chips and the battery connector.
Thanks a ton Jonathan, you were a big help in guiding me through this repair process cause in Bangladesh my country there's no support for repairing tiny electronic devices like this. I tried cleaning some of it with isopropyl alcohol on a cotton swab. But, then I noticed my Sprayway contact cleaner was expired in 2022 which makes it ineffective in 2024. I couldn't clean the internal of the USB C where I feel the mail culprit of the corosion lies if there is. Cause it was in my pocket and I was wet. And after cleaning it I still couldn't charge it. The battery still powers off automatically and the case turns off completely.
Now, as you asked me to try charge the headphones directly with the battery disconnected, well it works. But a few observations. It doesn't connect the first time. It connects the second time and it blinks red twice continuously. It charges the earbuds properly and also works to connect and disconnect from the phone but it shows red light blinking twice. Green and Orange light work too
And btw can I please get your email so that I can contact you directly if I need more assistance. If it's alright. Here's mine, zarif.kaisar@gmail.com
Red blinking is normal when the battery is disconnected. As it charges when the battery is disconnected, I assume the problem is the battery. Can't guarantee that there is no damage on other parts, however.
I don't do private support, I just wanted to help people by putting the howto on the site, so I'm not giving my email, sorry.
Thanks mate, you've been a tremendous help. And I respect your privacy and choices. One last question, it is charging no doubt, but the right earbud seems to discharge a bit quickly like going down from 99 % to 89 % after connecting and disconnecting it. Only the right one. The left one seems to discharge at a normal rate. Got any ideas?
And using this way until I can replace the battery would it cause any problems?
Can't help with that, sorry. The ear buds themselves are pretty hard to repair, but they should also be somewhat waterproof. There is another howto that shows how to replace the earbud batteries, you might want to look at that: Sony WF-1000XM4 Wireless Earbuds battery replacement
I had no problems using the case without a battery, I don't think it would cause any damage.
Man, the weirdest thing happened. I again wanted to test if the battery gets charged with force charging of sorts. I have power bank slash power brick from Baseus. Link here: Baseus Power Station 2 10000mAh Black Power Bank Price in BD. When you double press the power button in the picture it powered up the battery and the case turned on again. And now weirdly enough, after a few tries it charges. It is now charged up to 41% and now again I see flashes of red light. So, after I read on google that it can be due to the battery is heating up. So, yeah totally have to swap the battery soon, no question but I mean I am confused. Should I keep the battery connected use this way, I don't see and water anymore inside as I have used silica gel to extract all the moisture, and wait for the new battery to come? And tell me one thing how's the battery from your Amazon Affliate link? How long does it function properly?
Hola, hice todo el procedimiento paso a paso pero cuando conecto para cargar el estuche se enciende la luz roja que parpadea, lo que hice fue volver a conectar la batería original que tenia y si funcionaba correctamente al cargarlo.
Entonces luego probé en conectar el estuche para cargarlos sin ningún bateria conectada y enciende la luz roja parpadeando, al parecer es que el estuche no reconoce la batería nueva, necesito de su ayuda nose a que se debe esto.
Desde ya muchas gracias por una respuesta favorable.
Daniel -
The linked battery is 500mAh, but the battery in my case is 520mAh. Will this make much of a difference? Or should I find a 520mAh one?
asislife -
That shouldn't make much of a difference except that the new battery would have a little bit less capacity. But you can certainly try finding another compatible one, I just linked one random example.