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.

Here’s the summary for the wikipedia article you mentioned in your comment:

A betavoltaic device (betavoltaic cell or betavoltaic battery) is a type of nuclear battery which generates electric current from beta particles (electrons) emitted from a radioactive source, using semiconductor junctions. A common source used is the hydrogen isotope tritium. Unlike most nuclear power sources which use nuclear radiation to generate heat which then is used to generate electricity, betavoltaic devices use a non-thermal conversion process, converting the electron-hole pairs produced by the ionization trail of beta particles traversing a semiconductor.Betavoltaic power sources (and the related technology of alphavoltaic power sources) are particularly well-suited to low-power electrical applications where long life of the energy source is needed, such as implantable medical devices or military and space applications.

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