503759 3.7V 1200mAh LiPo Battery

Product Description — 503759

503759 High-Capacity Rechargeable Li-Polymer Headset Battery | 3.7V 1200mAh | 3-Wire | Wireless Headphone & Gaming Headset Replacement

Overview

The 503759 Li-Polymer Headset Battery is a high-capacity, precision-engineered rechargeable replacement cell purpose-built for the demanding power requirements of wireless headphones, professional gaming headsets, and premium audio wearables. With a robust 3.7V nominal voltage and a generous 1200mAh capacity housed in a compact 5.0 × 37 × 59mm soft-pack body, this battery delivers significantly extended listening and gaming sessions between charges — all in a form factor engineered to fit the tight internal geometry of modern headset ear cups and headband modules.

The 3-wire configuration — comprising positive, negative, and thermistor/NTC leads — is specifically designed for headsets with built-in battery management and temperature monitoring circuits, ensuring full compatibility with the charging and protection systems of premium wireless audio devices. A direct drop-in replacement for a wide range of compatible headset brands, the 503759 restores original or improved battery performance to aging devices without the cost of full product replacement.

Product Specifications

Understanding the 3-Wire Configuration

💡 The third NTC thermistor wire is a critical safety feature in premium wireless headsets. It allows the headset’s Battery Management System (BMS) to monitor cell temperature in real time and adjust or terminate charging if the battery exceeds safe thermal limits — preventing overheating during fast charging cycles. Replacing a 3-wire headset battery with a standard 2-wire cell will disable this safety function and may trigger charging errors on the host device.

Key Features

• High 1200mAh Capacity — Delivers dramatically extended playback and gaming sessions compared to worn-out original batteries, restoring and often surpassing factory-new runtime performance in compatible headsets
• 3-Wire NTC Thermistor Design — The integrated temperature sensing wire ensures full compatibility with the Battery Management Systems of premium wireless headsets, maintaining all original charging safety protocols including temperature-based charge termination and thermal protection
• Stable 3.7V Output for Audio Circuits — Consistent voltage delivery throughout the discharge cycle prevents audio quality degradation, Bluetooth signal instability, or ANC (Active Noise Cancellation) performance drops as the battery depletes — common issues with worn or substandard replacement cells
• Slim 5.0mm Profile — Fits within the constrained internal cavity of headset ear cups and headband battery compartments without requiring housing modification or forced fitment
• High Capacity Upgrade Potential — At 1200mAh, the 503759 may offer higher capacity than many original factory-installed headset batteries, directly translating to longer continuous use time per charge cycle
• Low Internal Resistance ≤ 150mΩ — Minimizes voltage sag under the sustained moderate drain of wireless audio circuitry, Bluetooth chips, and ANC processors, maintaining clean stable power delivery throughout the listening session
• Built-In Protection Circuit (PCM) — Overcharge, over-discharge, over-current, and short-circuit protection layers provide redundant safety alongside the host headset’s own BMS
• 500+ Cycle Life — Long-term reliability significantly extending the usable lifespan of repaired or refurbished headsets, making the 503759 equally suitable for professional repair shops and individual end-user self-repair
• Lightweight Soft-Pack Construction — Flexible polymer pouch design adds minimal weight to the headset, preserving wearing comfort and balance across extended listening or gaming sessions
• Low Self-Discharge — Retains charge effectively during storage, ensuring headsets remain ready for immediate use even after extended periods of inactivity

Applications

• 🎧 Wireless over-ear & on-ear headphones
• 🎮 Gaming headsets — console, PC & mobile
• 🎙️ Professional studio & monitoring headphones with wireless capability
• 📞 Bluetooth office & call-center headsets
• 🎵 Premium consumer audio headphones
• 🔇 Active Noise Cancelling (ANC) wireless headsets
• 🛠️ Headset repair, refurbishment & battery replacement services
• 🏭 OEM headset production battery supply

Headset Battery Replacement Guide

When to Replace Your Headset Battery

Key Compatibility Checks Before Ordering

1. ✅ Confirm battery dimensions fit your headset cavity: 5.0 × 37 × 59mm
2. ✅ Confirm your headset uses a 3-wire battery connector (not 2-wire)
3. ✅ Confirm connector pitch matches — JST-PH 1.25mm or 2.0mm most common
4. ✅ Confirm wire polarity order matches original — photos available on request
5. ✅ Operating voltage 3.7V nominal / 4.2V max — standard for all Li-Polymer headset batteries

Why a Quality Replacement Battery Matters

Cheap, uncertified headset replacement batteries are one of the most common sources of:

• Charging errors — incompatible NTC resistance values trigger BMS faults
• Premature shutdown — actual capacity far below rated, often 30–50% lower
• Swelling — substandard cells swell within weeks of installation, damaging headset housing
• Overheating — absent or incorrectly rated NTC thermistors disable thermal protection

The 503759 uses a correctly rated NTC thermistor matched to industry-standard headset BMS requirements, rated capacity verified by 100% pre-shipment testing, and standard-compliant PCM protection — ensuring a safe, reliable, long-lasting replacement that performs as specified from day one.

Compatibility

The 503759 is designed as a universal high-capacity replacement battery for wireless headphones and gaming headsets utilizing a 3.7V lithium polymer cell in the 5.0 × 37 × 59mm form factor with a 3-wire NTC thermistor connector.

⚠️ Always verify dimensions (5.0 × 37 × 59mm), wire count (3-wire), connector pitch, and wire polarity order against your original battery before installation. Custom connector configurations, wire lengths, and NTC thermistor resistance values available on request for OEM and repair trade customers.

Why Choose This Battery

• 🏭 Factory Direct — Fully in-house manufacturing with end-to-end process control ensuring consistent batch quality and competitive pricing
• ✅ In Stock & Ready to Ship — Warehoused inventory for immediate same or next business day dispatch on all standard and bulk orders
• 🔬 100% Pre-Shipment Testing — Every unit individually tested for capacity, voltage accuracy, NTC thermistor resistance value, internal resistance, and PCM function before dispatch
• 🌡️ Correctly Rated NTC Thermistor — Thermistor resistance value matched to industry-standard headset BMS specifications, ensuring full charging system compatibility
• 🎧 Headset-Specific Engineering — Discharge profile, internal resistance, and 3-wire configuration purpose-optimized for the unique power demands of wireless audio and gaming headset circuits
• 🔧 Full OEM / Repair Trade Support — Custom connector type, wire configuration, NTC value, capacity, and bulk packaging available for repair shops, refurbishers, and headset manufacturers
• 📋 Compliance Documentation — CE, RoHS, UN38.3 Test Report, and MSDS available for import compliance and retail regulatory requirements
• 🌍 Global Export Ready — Complete lithium battery hazardous goods documentation managed in-house for smooth international shipping

Package Contents

• 1× 503759 Li-Polymer Headset Battery (3.7V / 1200mAh) — 3-Wire NTC Configuration
• Optional: JST-PH 1.25 / 2.0mm connector | custom wire length | alternative NTC resistance value | protective film wrap

💡 Bulk pricing for repair trade and OEM production orders available. Please provide your headset model or original battery specifications — our technical team will confirm compatibility and connector configuration before shipment.