[ceejayoz]

The bigger issue using it in pacemakers is it's actually beneficial to have a battery that needs replacing every 10 years or so - pacemaker tech gets better so fast that a 30 year old device would be crap compared to the current generation.

[banana_bread]

How much better really, if the current one wasn't working well you would find out real quick.

[ceejayoz]

More sophisticated programs (fewer false positives and false negatives), smaller devices, batteries that last longer between charges, etc.