They already have small ones ,AA. AAA and some 9 vote ones, but they cost a lot, they need to get the cost down and advertise the fact that they will last thousands of years,
here is some reading on costs.
How much do Nuclear Diamond Batteries cost
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Cost of Nuclear Diamond Batteries
Nuclear diamond batteries are among the most advanced long‑life energy storage technologies, and their cost depends heavily on the type, size, and power output.
Current cost estimates
Nano‑Diamond Battery (NDB): Around $20 per nanowatt of output
thebatterytips.com
thebatterytips.com
+1
. This is a per‑power‑unit rate, meaning the total cost scales with the amount of power you need.
Carbon‑14 diamond batteries: Estimated at a few hundred to several thousand dollars for a single unit, with lifespans up to about 5,700 years
www.sourcifychina.com
www.sourcifychina.com
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General nuclear diamond batteries: Historically, early prototypes were priced at $2.4 million per kilogram of material, but costs have dropped significantly over time — for example, from $2.4M/kg in earlier research to $40,000 in 2018
myelectricsparks.com
myelectricsparks.com
.