IoT & Sensor Node Battery Guide

CR2450 cells deliver high capacity in a 24.5 × 5.0 mm, 3V lithium package (~550–620 mAh) — ideal for devices that must run months on a single coin cell. Do not confuse with the smaller CR2032 or the thinner CR2430.

A CR2032 is a 3V lithium manganese-dioxide coin cell, 20.0 × 3.2 mm, typically 220–240 mAh (about 0.66–0.72 Wh). Fresh cells often measure 3.2–3.4 V. DL2032 and ECR2032 are brand labels for the same size. CR2025 and CR2016 share the 20 mm diameter but are thinner and not drop-in replacements. Do not use rechargeable LIR2032 (~3.6–3.7 V) unless the device is designed for it.

CR2430 is a 24.5 × 3.0 mm lithium coin cell — thicker than CR2032 but thinner than CR2450.

CR2354 is a high-capacity 23 × 5.4 mm lithium coin cell — often searched alongside CR2450 but not the same diameter.

AA (LR6) is the world's most common cylindrical battery size at 14.5 × 50.5 mm.

18650 is an 18 × 65 mm lithium-ion cell — the backbone of many rechargeable product battery packs.

CR123A (CR17345 / DL123A) is a 3V lithium cylindrical cell (~17 × 34.5 mm, ~1400–1600 mAh) prized for high pulse current and long shelf life. It is not the same as the smaller CR2 or the much larger 18650.