357090 3.7V 2500mAh Polymer Battery Making Machine Key Copying Lipo Lithium

The 357090 polymer lithium battery delivers outstanding high energy density, packing a full 2500mAh capacity into an ultra-slim 3.5mm thick profile. This allows portable devices to achieve longer runtime without increasing overall size or weight.

Compared to traditional cylindrical cells, the soft-pack polymer structure stores more energy per unit volume, making it the ideal power source for space-constrained applications like tablets, e-readers, and industrial handheld tools.

Furthermore, this battery fully supports custom shaping. Unlike rigid 18650 cells, the aluminum-plastic film casing can be manufactured in non-standard forms—including stepped, arc-shaped, or ultrathin configurations—to perfectly fit unique device cavities.

Power banks and key cutting/copying machines: These devices require a stable 3.7V power source with moderate capacity and reliable discharge characteristics. The 357090's flat discharge curve ensures that voltage remains consistent throughout the entire usage cycle, preventing unexpected shutdowns during critical operations.

Flashlights and miner lamps: Illumination devices—especially those used in underground or outdoor environments—demand batteries that can deliver sustained high current without overheating. The 357090's low internal resistance (≤60mΩ) minimizes energy loss as heat, converting more stored power into light.

Zero leakage risk: Unlike traditional liquid-electrolyte cylindrical cells, this polymer battery uses a gel or solid-state polymer electrolyte. Even under extreme conditions, the semi-solid electrolyte will not flow out of the casing, eliminating the risk of corrosive electrolyte leaking onto sensitive circuit boards.

Crush test passed: The 357090 has undergone rigorous crush testing according to international safety standards. When subjected to extreme external force, the soft pouch cell will only bulge or deform—it will not ignite or explode, even under severe crushing pressure.

High-temperature stability: When exposed to a scorching 50℃ environment, the battery maintains over 85% of its rated capacity. Its internal chemistry resists thermal runaway, and the aluminum-plastic casing dissipates heat efficiently.

Extreme cold start capability: In freezing conditions as low as -20℃, the 357090 can still activate and provide more than 60% of its discharge capacity. This is critical for outdoor equipment and emergency devices stored in unheated environments.

• Grade A cells ensuring high and full capacity performance
• Dual IC chips protection against overcharge, over-discharge, over-current, and short circuits
• Injection technology for enhanced battery stability
• Long life cycle design

• Customizable sizes, models and capacities with thickness from 1 to 12mm
• Wide capacity range from 15-10000mAh
• Built-in BMS or PCB protection for overcharge and discharge safety
• Lightweight design: 1/3 weight of lead acid batteries
• Custom voltage, capacity, and connector options available
• Wide operating temperature range: -20°C to 60°C
• High power output with low self-discharge rate (less than 3% monthly)
• No memory effects with highly efficient charging capability
• Environmentally friendly green product
• Short delivery times with comprehensive service support

• HK UPS Express: 4-6 days delivery
• Air Cargo: 7-10 days delivery
• Sea Shipment: Approximately 1 month delivery

• Consumer electronics: digital cameras, MP3/MP4 players, PDAs, electronic dictionaries
• Electric tools: saws, drills, and power tools
• Household appliances: portable vacuum cleaners, electric mops
• Electric toys: remote control toys, model vehicles
• Electric vehicles: bicycles, cars, and mobility devices
• Lighting: emergency lights, solar lights, LED lighting
• Beauty and healthcare: electric beauty devices, hairdressing tools
• Medical devices: portable medical equipment, hearing aids
• Industrial applications: instruments, GPS systems, access control

• ISO9001:2015 certified factory with strict quality control
• Comprehensive quality assurance with 100% production inspection
• Professional R&D center supporting OEM and ODM customization
• Low MOQ with strong production capacity and stock availability
• Authorized international certifications compliance
• Excellent customer service with 12-month warranty

• High standard quality management with ISO9001:2015 and TUV-UL certification
• Comprehensive battery solutions provider