The **Panasonic LC-R121R3P** is a Valve Regulated Lead-Acid (VRLA) rechargeable battery, commonly used in Uninterruptible Power Supplies (UPS), emergency lighting, and medical equipment. Below is a detailed breakdown of its electronic and physical specifications. --- ### 1. General Specifications This battery belongs to Panasonic’s "Standard Main Power" series, designed for a balance between cycle life and standby reliability. | Feature | Specification | | :--- | :--- | | **Nominal Voltage** | 12V | | **Nominal Capacity** | 1.3 Ah (at 20-hour rate) | | **Weight** | Approximately 0.59 kg (1.30 lbs) | | **Terminal Type** | Faston 187 (4.75mm width) | | **Chemistry** | Lead-Acid (Pb) | | **Casing Material** | UL94 HB Flame retardant (Standard) | --- ### 2. Electrical Performance Characteristics The performance of the LC-R121R3P is defined by its discharge rates and charging requirements. * **Capacity Retention:** * 100% at 20°C (after 3 months storage). * 82% at 20°C (after 6 months storage). * **Charging Voltage (at 25°C):** * **Cycle Use:** 14.5V to 14.9V (Initial current should be 0.52A or smaller). * **Trickle/Standby Use:** 13.6V to 13.8V. * **Temperature Influence:** Capacity increases slightly at higher temperatures but significantly reduces the overall lifespan of the chemical cells. --- ### 3. Physical Dimensions Precision is required when replacing this part in compact electronic enclosures. | Dimension | Measurement (mm) | | :--- | :--- | | **Length** | 97.0 mm | | **Width** | 47.5 mm | | **Height** | 50.0 mm | | **Total Height (Terminals)** | 55.0 mm | --- ### 4. Key Electronic Features * **Leak-Proof Construction:** Uses an electrolyte suspension system (AGM - Absorbed Glass Mat) which retains the electrolyte in a porous glass fiber mat. It can be operated in any orientation without leaking. * **Pressure Relief Valve:** Includes a self-sealing safety valve that releases excess gas pressure if the battery is overcharged, preventing casing rupture. * **Low Self-Discharge:** High-purity lead-calcium alloy grids minimize self-discharge, allowing for longer shelf life compared to conventional lead-acid batteries. --- ### 5. Common Applications Due to its small form factor and 12V output, it is frequently found in: * **Security Systems:** Backup power for alarm panels. * **Laboratory Equipment:** Portable testing devices. * **Power Tools:** Small cordless appliances. * **UPS Systems:** Small-scale battery backups for networking gear.