Improved batteries also led to a beefed-up version of a pacemaker that could restart the heart, and correct irregular or dangerously fast heartbeats, when necessary.

电池得到改善，心律调整器的功能也得到加强，具有心脏起搏，矫正紊乱或过快心律的功能。

youdao

Dr Amin Karami told a meeting of the American Heart Association that pacemaker batteries needed to be replaced approximately every seven years.

BBC: Heartbeat 'could power pacemaker'

At a news conference at the Vatican, Father Lombardi confirmed that the batteries in the pacemaker, which had been fitted several years ago, had been replaced in the routine operation.

BBC: Pope Benedict has a pacemaker, the Vatican confirms

Earlier this week, the Vatican said for the first time that Pope Benedict had a pacemaker, and that he had undergone surgery to replace the batteries three months ago.

BBC: Pope Benedict hints he will retire into seclusion