The **3SB 12-R** refers to a specific type of **lead-acid rechargeable battery**, commonly used in emergency lighting, UPS systems, and security alarms. The nomenclature typically denotes a **12V 12Ah** Sealed Lead Acid (SLA) battery. --- ### Technical Specifications The "3SB" series follows standard industrial electrical ratings. Below are the primary electronic characteristics: | Parameter | Value / Specification | | :--- | :--- | | **Nominal Voltage** | 12 Volts DC | | **Nominal Capacity** | 12.0 Ampere-hours (Ah) | | **Chemistry** | Sealed Lead Acid (SLA) / AGM | | **Terminal Type** | F1 or F2 (Faston Tabs) | | **Internal Resistance** | Approx. 14mΩ - 18mΩ | | **Max Discharge Current** | ~180A (for 5 seconds) | | **Cycle Life** | 300 - 500 cycles (at 50% DOD) | --- ### Key Electronic Components & Internal Design #### 1. The Plate Grids (Lead-Antimony/Calcium) The internal structure consists of lead alloy grids. These serve as the mechanical support for the active material and the electrical conductor for the current. #### 2. AGM Separator (Absorbent Glass Mat) The "R" in many modern equivalents implies a rugged or regulated design. The **AGM** is a fine fiberglass mat saturated with sulfuric acid. * **Function:** It prevents short circuits between plates while allowing ions to flow freely. * **Benefit:** Makes the battery "non-spillable" and allows it to be mounted in any orientation. #### 3. Electrolyte (Sulfuric Acid) The chemical medium ($H_2SO_4$) that facilitates the movement of ions between the positive and negative plates during charging and discharging. #### 4. Pressure Relief Valve (VRLA) A safety feature that automatically releases excess gas (hydrogen and oxygen) if the internal pressure builds up due to overcharging. This prevents the casing from bursting. --- ### Charging Parameters To ensure the longevity of the 3SB 12-R, the following charging profiles must be maintained: * **Float Charge:** 13.5V to 13.8V (for standby use). * **Cycle Charge:** 14.4V to 15.0V (for active portable use). * **Max Charging Current:** Should not exceed **3.6A** (30% of Ah rating). --- ### Typical Applications * **Fire & Security:** Alarm panels and backup sirens. * **Power Supply:** Small Uninterruptible Power Supplies (UPS). * **Mobility:** Electric scooters and powered wheelchairs. * **Medical:** Portable oxygen concentrators and clinical monitors.