MC-303: A question

[trl888]

MC-303: A question
hello everybody!
I have a question about mc-303, im planning to buy it and i got the user manual from internet and i found this:

This unit contains a battery which powers the units memory circuits when power is off. When this battery is low error message will be shown on the display.Once you see this message, the battery must be replaced as soon as possible to avoid the loss of all data in the memory.To have the battery replaced, please contact your dealer or qualified roland personnel.

Have any of you had this error message, how long does this battery last? What kind of battery is this? Does roland still do this battery change operations? I study electronics so i could probly replace it myself if i knew what kind of battery it is?

If you know ANYTHING about this, PLEASE ANSWER, i would be VERY GRATEFUL!

Lauri