Here is another topic about the MS 40 battery change.

http://www.synthzone.com/forum/ubbthreads.php/topics/406600/Solton_(Ketron)_MS40_internal_

Hope it's for any help.
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Cheers 🥂
GJ
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"Success is not counted by how high you have climbed
but by how many you brought with you." (Wil Rose)