<p><span class="h-card" translate="no"><a href="https://hachyderm.io/@uriy" class="u-url mention">@<span>uriy</span></a></span> <span class="h-card" translate="no"><a href="https://galaxians.garden/users/hexylena" class="u-url mention">@<span>hexylena</span></a></span> NASA also produces a handy one watt unit in a C cell sized package <a href="https://science.nasa.gov/planetary-science/programs/radioisotope-power-systems/thermal-radioisotope-heater-units/" target="_blank" rel="nofollow noopener" translate="no"><span class="invisible">https://</span><span class="ellipsis">science.nasa.gov/planetary-sci</span><span class="invisible">ence/programs/radioisotope-power-systems/thermal-radioisotope-heater-units/</span></a></p>