The term **354015** most commonly refers to a specific size specification for **Lithium Polymer (LiPo) batteries**. These batteries are widely used in small electronic devices due to their slim profile and high energy density. --- ### 1. Decoding the Part Number (354015) In the world of LiPo batteries, the six-digit number represents the physical dimensions of the cell in millimeters (mm). | Component | Measurement | Description | | :--- | :--- | :--- | | **First two digits (35)** | **3.5 mm** | The **Thickness** (height) of the battery. | | **Middle two digits (40)** | **40 mm** | The **Length** of the battery. | | **Last two digits (15)** | **15 mm** | The **Width** of the battery. | --- ### 2. General Technical Specifications While different manufacturers (like Akku, Fullwatt, or generic brands) may have slight variations, a standard 354015 battery usually follows these specs: * **Chemistry:** Lithium-ion Polymer (LiPo). * **Nominal Voltage:** 3.7V. * **Full Charge Voltage:** 4.2V. * **Capacity:** Typically ranges between **180mAh and 250mAh** (depending on the internal density). * **Protection Circuit (PCM):** Most units include a small PCB under the yellow Kapton tape to prevent overcharging, over-discharging, and short circuits. --- ### 3. Common Applications Due to its small and flat footprint, the 354015 part is typically found in: 1. **Wearables:** Smartwatches, fitness trackers, and Bluetooth headsets. 2. **Miniature Electronics:** Small voice recorders, LED flashlights, and MP3 players. 3. **IoT Devices:** Tiny sensor nodes and wireless transmitters. 4. **Toys:** Micro drones or small remote-controlled vehicles. --- ### 4. Safety and Handling `354015` batteries are volatile if mishandled. Follow these standard precautions: * **Charging:** Use a dedicated LiPo charger. Do not exceed a charge rate of 1C (e.g., if the battery is 200mAh, do not charge faster than 200mA). * **Storage:** Store at roughly 3.8V (half-charged) if not using for long periods. * **Physical Damage:** Never puncture, crush, or expose the cell to temperatures above 60°C (140°F).