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replace a battery in a ACL lifestyle LP522 heating programmer?

The back-up battery seems to have died; otherwise, the controller works OK.
Is it easy to buy a replacement battery, dismantle the unit and replace the battery?
I gather there is some soldering to do.
Paul B, April 2013
British Gas said they couldn't get a replacement battery, so they simply gave me a new programmer instead. How daft is that!

Robert Walter, August 2019