The terms **R03 through R12** are standardized designations for dry cell batteries, primarily established by the International Electrotechnical Commission (IEC). These codes define the physical size, shape, and chemistry of common consumer batteries. --- ### Comparison of R03 to R12 Batteries The following table breaks down the technical specifications and common names for these electronic parts: | IEC Name | Common Name | Type | Voltage | Dimensions (mm) | Typical Use | | :--- | :--- | :--- | :--- | :--- | :--- | | **R03** | AAA | Cylindrical | 1.5V | 10.5 × 44.5 | Remotes, small toys | | **R1** | N | Cylindrical | 1.5V | 12.0 × 30.2 | Pagers, microphones | | **R6** | AA | Cylindrical | 1.5V | 14.5 × 50.5 | Wall clocks, mice | | **R10** | (Obsolete) | Cylindrical | 1.5V | 21.0 × 37.3 | Vintage torches | | **R12** | 3R12 | Flat Pack | 4.5V | 62 × 67 × 22 | Lanterns, testing gear | --- ### Technical Breakdown #### 1. Chemistry Prefixes In the IEC naming convention, the "R" stands for **Round** (cylindrical). However, you will often see prefixes added to these codes to indicate the chemical composition: * **R:** Zinc-Carbon (Standard duty) * **LR:** Alkaline (High drain) * **FR:** Lithium/Iron Disulfide (Long life) * **HR:** Nickel-Metal Hydride (Rechargeable) *Example: An **LR03** is an Alkaline AAA, while an **R03** is a Zinc-Carbon AAA.* #### 2. The R12 (The "Lantern" Battery) Unlike the single-cell R03 or R6, the **R12** is rarely used alone. It is most famous in its **3R12** configuration. This is a large, rectangular battery pack containing three R12 cells connected in series to provide **4.5 Volts**. It features two metal strips (spring contacts) on top. #### 3. Voltage vs. Capacity While R03, R1, R6, and R10 all provide **1.5V**, their capacity (mAh) differs significantly based on their volume. * **R03 (AAA):** Approx. 800–1200 mAh. * **R6 (AA):** Approx. 2000–3000 mAh. * Large cells can provide power for much longer periods under the same load. --- ### Usage Summary * **R03 (AAA) & R6 (AA):** The most common consumer electronics parts used today. * **R1 & R10:** Specialty or "legacy" sizes used in specific industrial or vintage equipment. * **R12:** Primarily found in heavy-duty flashlights or school physics experiment kits.