The suffering should never be the point. It never gives meaningful satisfaction to the bereaved and affected and studies support this.
It is only human and normal to burn with anger and a desire to see monsters such as this torn apart and made to suffer.
This is part of our animal mind that views tribal justice and the dubious 'wisdom of the crowds' as absolute, and most of the fuckdamn reason we've spent so long learning how to live around millions of each other is in part giving up these outdated and unhelpful social traits.
In the long run, from the cultural perspective, no amount of his suffering will bring his victims back, and no amount of suffering will convince him that he was morally wrong.
So execute him, and quickly, and spend the money otherwise that would have covered his upkeep on free food for single parents.
The innovation isn't the product, it is the manufacturing. The cells in pacemakers had the housing of the pacemaker to protect from puncture.
These devices are meant to go in portable electronics so puncture safety is far more critical.
Honestly radioactive copper as a low volt lifetime battery is an interesting idea. It won't live power a phone but it could charge it while inactive.
Good for camping where solar isn't viable.