Korg M1 internal battery low

The Lounge Other Gear
1

Hi

I bought a cheap Korg M1 last week and the internal battery is low.
At the moment mine is still working and it sounds pretty good.

Is there anyone that has experience with changing the battery and putting the factory sounds back inside?

2

No experience myself but…

http://youtu.be/Ta3ADqR7U8M & http://youtu.be/UOhXcI38Juw

3

Thanks for the Link