Long-shelf-life 3-volt lithium coin cells in the CR2016 size. Duracell's child-secure blister packaging and bitter coating add a layer of safety against accidental ingestion - important since coin cells cause serious chemical burns if swallowed.

• 3-volt lithium manganese dioxide (CR2016) coin cell
• 20mm diameter x 1.6mm thick - thinner profile than CR2025 or CR2032
• Common uses: car key fobs, garage door remotes, small calculators, fitness rings, slim wearables, motherboard backup, hearing-aid programmer remotes
• 10-year guaranteed shelf life when stored sealed at room temperature
• Child-secure blister card and bitter coating help discourage accidental ingestion
• 2 batteries per card

Tip: CR2016, CR2025, and CR2032 share the same 20mm diameter but differ in thickness (1.6mm vs 2.5mm vs 3.2mm). They are NOT interchangeable - using a thinner cell where a thicker one is specified gives poor contact and short runtime. Check your device's battery compartment for the exact CR number before ordering.