A primary cell is a battery (a galvanic cell) that is designed to be used once and discarded, and not recharged with electricity and reused like a secondary cell (rechargeable battery).
A specialty battery is a power solution in a specialty device or system with the designation of a specific purpose. Whatever your specialty device needs, SFB has a specialty battery replacement for you.
A critical system is a system which must be highly reliable and retain this reliability as they evolve without incurring prohibitive costs. There are four types of critical systems: safety critical, mission critical, business critical and security critical.