Undercover Mouse Revisited

We started having trouble with the Undercover Mouse.  First, it didn't seem to want to turn off.  Then it seemed to have a motor problem, as the arm was moving only very slowly.

We're using rechargeable batteries in the UM.  The charger has a "refresh" setting.  Rechargeable batteries can lose their ability to hold a full charge, and this "refresh" setting is supposed to "reset" the batteries and restore their ability to hold the charge.  We refreshed the batteries and then put them back in the UM, and, voila, the UM worked normally again!

That's a good thing, because Ivan and Boo LOVE that toy!