HYS 102540 4P 3.7V 4400mAh Lithium Polymer Battery Pack.

Key Product Advantages 1. High‑capacity 4‑parallel DesignFour cells in parallel raise total capacity and allow higher continuous discharge current. Extend equipment working time, ideal for devices requiring long‑hour operation. Strict cell sorting avoids voltage deviation among parallel cells. 2. Reliable Safety PerformanceBuilt‑in PCM protection circuit against over‑charge, over‑discharge, over‑current and short‑circuit. Optimized cell formula suppresses lithium dendrite precipitation, lowering risks of swelling and internal short‑circuit for long‑term standby. 3. Soft‑pack Flexible StructurePouch lithium‑polymer design provides good space adaptability, suitable for multiple product shell structures. Low self‑discharge rate, outstanding long‑time standby performance. 4. Full B2B Customization SupportCustomizable wire length, different connector options, surface brand label printing. We accept small trial orders for prototype testing and large‑volume bulk orders. 5. Complete Export ComplianceMeet UN38.3, MSDS, RoHS requirements. Complete shipping documents are supplied for global sea and air customs clearance.  Application Scenarios • Portable mini backup power supply • Outdoor camping lamps & portable lighting • Medium‑size Bluetooth speakers • Monitoring cameras & IoT devices • Portable medical auxiliary equipment • Other medium‑capacity 3.7V consumer electronic products  B2B Factory Service ✅ Factory direct wholesale with stable production capacity✅ Strict aging & load test for every finished pack✅ OEM & ODM custom: wire, connector, label printing✅ Professional engineering team provides technical support✅ Flexible MOQ for trial sample and mass purchase