An interesting point further down in the MHRA document is:
An organisation could be held responsible under health and safety law and civil liability in the event that a patient or member of personnel died or suffered personal injury or damage as a result of inappropriate replacement of batteries.
I know of a fire started in a hospital due to a battery fault in a laptop on test after repair. It resulted in damage to equipment costing them over £600,000! Should make you think about the savings you thought you made!