For applications needing a 3V supply, CR2032 coin cells offer a readily available, inexpensive solution. However, they have lower capacity than other options.
Lithium Thionyl Chloride (Li-SOCL2) batteries provide significantly higher energy density and longer shelf life, making them suitable for long-term deployments. However, they are generally more expensive and possess a higher self-discharge rate compared to CR2032s. Their voltage is closer to 3.6V, so voltage regulation might be needed.
Lithium Polymer (LiPo) batteries offer higher capacities and more flexible form factors than coin cells. However, they require more sophisticated charging circuits and pose a safety risk if mishandled.
Two 1.5V alkaline batteries in series present a simple, readily available alternative. However, their voltage drops significantly during discharge, offering less consistent power and a much shorter lifespan compared to lithium options.
Consider these factors: your power requirements (current draw and runtime), budget, size constraints, and operational lifespan when selecting the right 3V battery.
