Which batteries can only be used when not firing, and why?

• A. 590, 390A, 390B, 2590 because they are rechargeable and wear out
• B. 5590 and 5390 because they are rechargeable
• C. 590, 390A, 390B, 2590 because they are non-rechargeable
• D. 5590 and 5390 because they wear out

Answer: (A)

Rechargeable batteries have a limited number of charge-discharge cycles, and their voltage can sag more under the high current and shock of firing. Because reliability is critical during a live shot, these packs are kept for use when the launcher is not firing, and they’re monitored for wear and eventual replacement. In this system, the rechargeable sets listed are the ones assigned to non-firing use and must be rotated as their capacity declines, which is why they’re described as wear-out items. The other batteries are non-rechargeable and are used in firing situations where a stable, single-use power source is preferred.