Under UN3091 P.I. 969 Lithium Metal Battery, Section II, the number of cells or batteries in each package must not exceed the number required for the equipment's operation plus how many spare sets?

• A. One spare set
• B. Two spare sets
• C. Three spare sets
• D. No spare sets allowed

Answer: (B)

The rule being tested is the limit on how many spare batteries you can ship with equipment when using lithium metal batteries. In UN 3091, Section II, the total number of cells or batteries in a package that contains or is packed with equipment may not exceed the number needed to operate the equipment plus two spare sets. This means you’re allowed to have two extra complete sets of batteries beyond what the device needs.

This helps minimize the amount of spare battery material in a single shipment while still allowing for replacement during use. For example, if the equipment requires one battery to function, you may include up to three batteries total (one in use plus two spares). If the device uses two batteries, you could ship up to four total (two in use plus two spares). The two spare sets are the maximum; having more than two spares would exceed the regulation, while having fewer is permitted.