503035 3.7V 500mAh LiPo Battery

Product Description — 503035

503035 Li-Polymer Rechargeable Battery | 3.7V 400mAh / 500mAh | TWS Earphone Charging Case | CB · IEC · KC · CE Certified

Overview

The 503035 Li-Polymer Rechargeable Battery is a compact, certification-ready power cell engineered specifically for TWS earphone charging cases and similarly sized portable charging enclosures. Available in both 400mAh and 500mAh capacity variants, the 503035 delivers stable 3.7V output within a slim 5.0 × 30 × 35mm form factor — providing the ideal balance of energy density and physical footprint for the tight internal geometry of modern earphone cases.

What truly sets the 503035 apart is its comprehensive multi-market certification portfolio — holding CB, IEC, KC, and CE approvals, this battery is pre-qualified for sale and integration across major global markets including Europe, South Korea, and international OEM supply chains, significantly reducing your time-to-market and compliance burden.

Product Specifications

Certifications

🏅 Holding CB, IEC, KC, and CE certifications simultaneously means the 503035 is pre-qualified for direct import, retail sale, and OEM integration across Europe, South Korea, and all CB scheme member markets — no additional safety testing required. Full certification documentation available upon request.

Key Features

• Dual Capacity Options — 400mAh & 500mAh — Two variants available within the identical 503035 form factor, giving OEM designers the flexibility to select the energy level that best fits their charging case charge-cycle target without any housing redesign
• Charging Case Optimized Design — The 503035’s charge and discharge characteristics are purpose-matched to the typical duty cycle of TWS earphone cases: multiple shallow partial charges per day, moderate sustained discharge into earphone pods, and extended standby periods between active sessions
• Stable 3.7V Output for Consistent Charging — Flat discharge voltage profile ensures that earphone pods receive a consistent input voltage throughout the case’s discharge cycle, preventing degraded or incomplete pod charging as the case battery depletes
• Slim 5.0mm Profile — Fits the compact internal geometry of modern ultra-slim charging case designs while delivering meaningful 400–500mAh capacity for multiple full earphone recharge cycles per case charge
• Multi-Certification Ready — CB, IEC, KC, and CE certifications eliminate the need for additional compliance testing when launching products in key global markets, compressing regulatory timelines and reducing certification costs for device manufacturers
• Built-In Protection Circuit (PCM) — Comprehensive overcharge, over-discharge, over-current, and short-circuit protection ensures safe operation within the closed environment of a charging case enclosure
• Low Internal Resistance ≤ 180mΩ — Minimizes heat generation during the repeated charge/discharge cycling inherent to charging case use, improving long-term thermal safety and cycle life
• 500+ Cycle Life — Engineered to outlast the typical product lifecycle of the earphone case itself, maintaining usable capacity across years of daily charging use
• Low Self-Discharge — Retains stored charge effectively during case storage, ensuring the case is ready to top up earphone pods even after days or weeks of inactivity
• Lightweight Construction — Minimal weight contribution preserves the premium feel and portability of slim charging case designs

400mAh vs 500mAh — Which to Choose?

💡 Both variants share identical dimensions and certifications. The choice is purely a runtime vs. form-factor trade-off — select 400mAh for the most compact designs, 500mAh where maximum pod recharge cycles per case charge is the priority.

Applications

• 🎧 TWS earphone & true wireless earbud charging cases
• 📦 Wireless headphone carry & charge cases
• 🔋 Compact portable charging enclosures
• 📡 Bluetooth audio accessory charging docks
• 🌐 IoT device charging hubs & compact power modules
• 🖊️ Smart pen & stylus charging cases
• 💊 Wearable device charging cradles

Global Market Compliance Map

📋 Full original certification test reports, certificates of conformity, and MSDS documentation available upon request for import clearance, retail compliance, and OEM product registration purposes.

Why Choose This Battery

• 🏭 Factory Direct Supply — Manufactured entirely in-house with complete process control from cell production through final certification testing and QC inspection
• 🏅 Multi-Market Certified — CB, IEC, KC, and CE certifications in hand — ready for immediate deployment in European, Korean, and international markets without additional compliance cost or delay
• ✅ Dual Capacity SKU Availability — Both 400mAh and 500mAh variants in stock, supporting flexible OEM product line development
• 🔬 100% Pre-Shipment Testing — Every unit individually tested for capacity output, voltage accuracy, internal resistance, and PCM function before packaging and dispatch
• 🔧 Full OEM / ODM Support — Custom connector type, wire length and polarity, PCM configuration, protective wrapping, capacity adjustment, and private label branding available for volume orders
• 📦 Low MOQ Supported — Flexible minimum order quantities to accommodate prototype runs, product launches, and full-scale production ramp-up
• 🌍 Global Export Ready — Full lithium battery hazardous goods and certification documentation managed in-house for smooth, compliant international logistics

Package Contents

• 1× 503035 Li-Polymer Battery (3.7V / 400mAh or 500mAh)
• Optional: JST-PH 1.25 / 2.0mm connector | bare wire leads | custom connector harness | protective film wrap
• Available: Full certification document package (CB / IEC / KC / CE test reports)

💡 Volume pricing, dual-SKU bundle arrangements, private label packaging, and full OEM / ODM configurations available. Contact our sales team with your charging case specifications for a dedicated sample and quote.