CR2032 Switch Benefits:
- More compact and slimmer design
- Better for space-constrained installations
- Typically lighter weight
- Excellent shelf life: 8-10 years (lithium-based)
- Performs better in a wider temperature range
2xAAA Switch Benefits:
- Longer operational battery life (2-3x the capacity of a CR2032)
- Less frequent battery changes needed
- AAA batteries are commonly available in most stores
- Easier to replace than the coin cell
- Moderate shelf life: 5-7 years for alkaline AAAs (less for heavy-duty/zinc-carbon)
- Lower self-discharge rate for lithium AAAs if those are used
The CR2032’s superior shelf life means the switch will likely work even after sitting unused for extended periods. This can be particularly valuable for:
- Switches in rarely used rooms
- Backup switches
- Places with intermittent use
If you plan to install the switch in a location where it might go unused for long periods, the CR2032 option has a distinct advantage due to its longer shelf life and lower self-discharge rate. However, if the switch will see regular use, the operational capacity advantage of AAAs may outweigh the shelf life consideration.
