The FDA is issuing this safety communication to alert health care providers and patients about issues that may cause batteries in certain Medtronic implantable pacemakers or cardiac resynchronization therapy pacemakers (CRT-Ps) to drain more quickly than expected.

http://www.fda.gov/medical-devices/safety-communications/fda-alerts-providers-and-patients-check-premature-battery-depletion-certain-medtronic-pacemakers-fda