The **LC-R127R2P1** is a specific model of a **Sealed Lead Acid (SLA)** battery manufactured by Panasonic. It is part of their "LC-R" series, designed for high reliability and cyclic or standby use. --- ### 1. Technical Specifications Below are the primary electronic and physical characteristics of the LC-R127R2P1: | Feature | Specification | | :--- | :--- | | **Nominal Voltage** | 12V | | **Nominal Capacity** | 7.2Ah (at 20-hour rate) | | **Chemistry** | Lead Acid (VRLA - Valve Regulated) | | **Terminal Type** | Faston 187 (4.75mm width) | | **Weight** | Approx. 2.40 kg (5.29 lbs) | | **Design Life** | 6 to 9 years (Standby use at 20°C) | | **Flammability Rating** | UL94 HB | --- ### 2. Internal Construction and "Parts" As an electronic component, the battery consists of several internal sub-sections that dictate its performance: * **Plates (Electrodes):** The positive plates are made of Lead Dioxide ($PbO_2$), and the negative plates are high-purity spongy Lead ($Pb$). * **AGM Separator:** It uses **Absorbent Glass Mat (AGM)** technology. The electrolyte (sulfuric acid) is immobilized in a fiberglass mat between the plates, making the battery spill-proof. * **VRLA Valve:** A one-way pressure relief valve. If internal pressure builds up due to overcharging, this valve releases gas to prevent the casing from bursting, then reseals. * **Case Material:** Typically made of high-impact ABS resin to withstand vibration and environmental stress. --- ### 3. Key Electronic Characteristics #### A. Charge Voltage (at 25°C) To ensure the longevity of the battery, specific charging voltages must be applied based on the application: * **Cycle Use:** 14.5V to 14.9V * **Standby (Float) Use:** 13.6V to 13.8V #### B. Discharge Curves The capacity of 7.2Ah is rated at a 20-hour discharge rate. If you draw current faster (e.g., 1-hour rate), the effective capacity drops significantly due to internal resistance and chemical limitations. #### C. Self-Discharge The LC-R127R2P1 has a low self-discharge rate. It typically retains about **85%** of its capacity after 6 months of storage at 20°C. --- ### 4. Common Applications Due to its 12V 7.2Ah rating, this is one of the most common battery sizes in the electronics industry: * **Uninterruptible Power Supplies (UPS):** Providing backup power for PCs and servers. * **Security Systems:** Powering alarm panels during grid failure. * **Medical Equipment:** Portable monitors and life-support devices. * **Emergency Lighting:** Powering exit signs and hallway lights.