I’m afraid that’s all I know from reading the forum.
Sorry
thanks for replying anyway 
thank you really very much
what I read around and in the forum is: • CR2450 3V 620 mha lithium perchlorate battery • MD mk2 battery is not soldered • the battery is located on the logic plate at the bottom of the box.
I would like to know if the battery specifications are right • if anyone can confirm points 1 and 2 and if there are any special tools to use. tnx a lot. .a.
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Silver Forever.
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That’s what I’ve read as well: Panasonic CR2450 3V battery
They don’t seem that difficult to open up. I can’t find any pictures, but I imagine it’s just one of those small clip holders where you slide it in or out, but worst case maybe a cover with a little screw or something to hold it down. Apparently it’s the older revisions that have a soldered in battery unit.
Post some pictures if you can! You’ll be the first on the internet from what I can tell. 
on point 2, re: soldered on, it may depend on the age of the MK2.
I was using a MK2 MM (non + Drive) , still from the plastic, non-rubberized knob era that had a battery go out. The battery was indeed soldered on.
As the MK2 refresh for MD was concurrent with MM, prepare yourself for the possibility that the battery is soldered on. Later MK2s switched away from soldered-on batteries.
Photo from that MM MK2:
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Thank you very much AdamJay great ones. Both my MM and MD are +D. Next week i’ll try to discover. Best pics around!
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So at the end of Via Tribunali on the left before arriving on Via Duomo in Naples there is a shop that sells the package of 2 energizers CR2450 on offer at 5.00 €.
Thanks to support of Martin Fred and Simon M this morning.
After unplugging the 6 screws and gently pulling the 10 knobs
You are in front of the user interface board with 12 screws
Simon gave me the specific measurements of the Torx T10.
As suggested by Fred it is advisable to have a magnetic screwdriver as the hardest part can be this even more so when putting it back if you do not have the appropriate tools the user board is connected to the bottom pcb through three pin connections to unplug gently lifting the front starting from the first to the left
At this point you can understand whether to continue or stop if the battery is soldered
I have continued …
I replaced the battery and confirmed the Panasonic CR2450.
I repeated the reverse operations
Thank you all
Achille
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Thank you for the detailed pics! I’ll probably have to do this within the next year or two on my MD, so this helps out a lot. Looks like a pretty easy swap as long as you have the right torx bit (pretty common these days).
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The MD gave me the message after about 5 years.
I suppose because I have been using intensive sampling lately …
I expect the message also from the monomachine shortly after about 7 years
These two machines are so versatile and perfectly integrated into my small setup that for me are irreplaceable.
And I will do my best to keep them at the top of the efficiency.
I hope Elektron support will never forget these two silver jewels.
Ach.
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Hi, I am waiting to get a Mk ii. The previous owner never replaced the internal lithium battery. Do you know if one can lose all saved patterns and sounds if battery dies? If so, I am considering to replace it even before I get any message of replacement from the machine itself. Thanks for any information and help. [quote=“ach, post:12, topic:46563”]
CR2450
[/quote]
Hi @LC!
You could always make a sysex dump and all is saved for the future(if you have Tm1 and a pc)
Just to make sure…
Thanks for the advice. I will try to get a TM1.
You are more than welcome!
I dont have deep knowledge in the MD,so im really happy if i can help someone!
If you have time(10x more literally)or your machine doesnt support the Turbo protocol than you can use most of the midi interfaces as i red online…
But i never tried anything but the Tm1,since it came with my MD
If you have a midi interface already just plug and give it a try.might just work…
No I don’t have any midi interface, only use hardware and a mixer. I have an A4 that happily connects to pc through its USB port when I need backup or data transfer. I will see what will be the best solution once I get to meet my MD. Cheers.
Thanks for this. Just bought a secondhand MD UW+ MKII with low battery status. Even with my total lack of skills, it only took about 10 minutes 
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My MD MkII showed me the ‘Low Battery’ warning message, so I opened it up in line with @ach’s photo guide earlier in this topic. It had the soldered-in battery. After contacting Elektron support, who were very helpful with advice, I chickened out of replacing the battery and its clip myself and opted to send it to Elektron’s US workshop. They gave me copious instructions for the return, which made the process run smoothly.
When the repair was done they charged me for 30 minutes of labour to replace the battery and clip, plus $6 for the parts.
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Following the steps here, one of my screws got stripped.
Does anyone know what to do for this situation? Also where to get more of these screws?
Did you get it removed? If not, you need a screw extractor, but need to be very careful with it mostly to avoid coming off the screw and badly damaging the faceplate. I would tape everything off as best as you can around the area of the damaged screw.
For replacement, I would try emailing Elektron first and they might be kind enough to mail one out to you. If that’s not possible, then you’ll need to look at your local hardware stores or Amazon and Ebay for Torx screws. I believe they are T10 size heads, but not sure about the length. You’ll just have to measure one you’ve pulled out. You’ll have to buy a bulk pack, but you can replace all of them to match.
If you’re not comfortable with any of this, then there’s always sending it back to Elektron or any reputable synth repair shop. Hope that helps and good luck.
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I think I’m gonna go through Elektron on this. I damaged the screw pretty bad.
I think they’re on holiday right now so wont be able to be in touch until next Tues-Wed.
Will keep this thread updated.
4/15 Update: They got back to me as soon as the holiday was over. Told me to ship my MD to the Los Angeles workshop. They’re going to replace the battery, fix the stripped screw, and change out the sticky knobs.
4/21 Update: Elektron Los Angeles got back and sent me a quote asking if I wanted to proceed. Getting it fixed! Probably would get it back next week. They have been super fast and kind.
5/1 Update: Maybe because of the Covid-19 situation, the process suddenly became a bit slow but today I received the MD in great condition - all issues fixed!
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