Nuclear fission is usually a response where the nucleus of the atom splits into two or even more smaller nuclei, although releasing Electrical power. The Super-Safe and sound, Compact & Straightforward – 4S “nuclear battery” – system is being made by Toshiba in Japan. It makes use of well-proven sodium https://tedomarket.com/product/computers-and-network/power-bank/battery-capacity/15001-20000mah/vinsic-alien-20000mah-dual-5v-2-4a-power-bank-ultra-slim-external-battery-portable-charger-for-iphone-samsung-smartphones/