The **SW645** typically refers to a **Lead-Acid Rechargeable Battery**, most commonly manufactured by brands like Sunwatt or Casil. These batteries are widely used in Uninterruptible Power Supplies (UPS), emergency lighting, and electronic toys. Below is a detailed breakdown of its electronic specifications and characteristics. --- ### 1. Key Technical Specifications The "645" in the model name usually denotes its voltage and capacity (6 Volts, 4.5 Ampere-hours). | Parameter | Specification | | :--- | :--- | | **Nominal Voltage** | 6V | | **Nominal Capacity** | 4.5Ah (at 20-hour rate) | | **Chemistry** | Sealed Lead Acid (SLA) / AGM | | **Terminal Type** | F1 (Faston Tab 187) | | **Weight** | Approx. 0.7kg - 0.8kg | | **Max Discharge Current** | ~60A (for 5 seconds) | --- ### 2. Charging Parameters To ensure the longevity of the SW645, it must be charged within specific voltage ranges depending on its use case. #### A. Cycle Use (Regular Charge/Discharge) Used in devices like electric scooters or portable lanterns. * **Voltage:** 7.20V to 7.50V * **Initial Current:** Less than 1.35A #### B. Standby Use (Float Charge) Used in UPS systems or emergency exit signs where the battery stays plugged in. * **Voltage:** 6.75V to 6.90V * **Initial Current:** No limit (though current naturally drops as charge finishes) --- ### 3. Internal Components and Construction The SW645 is a **Valved Regulated Lead Acid (VRLA)** battery utilizing **AGM (Absorbent Glass Mat)** technology: 1. **Plates (Electrodes):** Lead-antimony or lead-calcium alloy grids that hold the active material. 2. **Electrolyte:** Sulfuric acid absorbed into fiberglass mats (AGM). This makes the battery **spill-proof** and allows it to be mounted in any orientation. 3. **Safety Valve:** A one-way venting system that releases excess gas if internal pressure builds up during overcharging. 4. **Case Material:** Usually ABS plastic, which is impact-resistant and non-conductive. --- ### 4. Common Applications * **Security:** Alarm system backup power. * **Lighting:** Emergency exit lights and high-power flashlights. * **Consumer Electronics:** Small UPS units and children's ride-on toys (Power Wheels). * **Medical:** Portable patient monitoring equipment.