How easy is it to replace the battery in the Logitech Harmony Touch?

How easy is it to replace the battery in the Logitech Harmony Touch?

The Logitech Harmony Touch has a non-replaceable battery. It was released without a replaceable battery. How easy is it to replace yourself? I don't want to be spending $250 every 2-3 years on a new remote if it lasts that long. Considering the long running problems with Harmony & the battery problems on Harmony One, Harmony 900 what was Logitech thinking?

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