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Smart-home sensors: which battery?

Energizer's guide uses the phrase connected home devices. It does not name brands of sensor.

• CR123ALithium · 3 V · 17 × 34.5 mmGuide: connected home devices
• no drawingCR2Lithium · voltage not stated · size: see pageGuide: connected home devices
• CR-P2Lithium · 6 V · size: see pageGuide: connected home devices

Source: Energizer battery cross reference guide, Energizer, checked 2026-10-29. The guide pairs a cell with a kind of device. Your model may take a different cell.

All device types · Measure the old cell