451820 3.7V 140mAh LiPo Battery

Product Description — 451820

Silver Series 451820 Rechargeable Li-Polymer Battery Pack | 3.7V 140mAh | Smart Bracelet · Watch · Dog Trainer · Taillight | In Stock

Overview

The 451820 Silver Series Li-Polymer Battery is a miniature, high-reliability rechargeable cell engineered for ultra-compact wearable and portable electronics. Delivering a stable 3.7V nominal voltage and 140mAh capacity within a tiny 4.5 × 18 × 20mm footprint, this battery punches well above its size — providing consistent, dependable power for smart bracelets, watches, dog training collars, bicycle taillights, and any compact device where every cubic millimeter of internal space counts.

Built to Silver Series quality standards with tighter capacity tolerances and enhanced cell consistency, the 451820 is available in stock for immediate shipment — eliminating lead time delays for both replacement buyers and OEM production schedules.

Product Specifications

Key Features

• Micro Form Factor — 4.5 × 18 × 20mm — One of the most compact LiPo configurations available, the 451820 is purpose-built for the smallest wearable enclosures including slim bracelet bands, miniature watch housings, dog training collar modules, and bicycle taillight units where space constraints are extreme
• Silver Series Premium Grade — Manufactured to tighter capacity tolerances and stricter cell-to-cell consistency than standard-grade LiPo cells, ensuring reliable, predictable performance across every unit in every batch
• Stable 3.7V Discharge Performance — Flat, consistent voltage output from full charge to cutoff prevents erratic device behavior, sensor drift, or premature low-battery shutdowns during active use
• Optimized for Wearable Duty Cycles — Low charge current support and efficient discharge characteristics align precisely with the intermittent-use, low-drain power profiles typical of fitness trackers, smart bracelets, and activity monitors
• Dog Trainer & Outdoor Device Ready — Robust operating range down to -20°C ensures reliable performance in all outdoor conditions, from warm-weather training sessions to cold-climate field use
• Taillight & Cycling Accessory Compatible — Compact dimensions and vibration-resistant soft-pack construction make the 451820 an ideal power source for handlebar-mounted and seat-post cycling accessories
• Built-In Protection Circuit (PCM) — Fully integrated overcharge, over-discharge, over-current, and short-circuit protection safeguards both the battery and connected device electronics under all operating conditions
• 500+ Cycle Life — Long service lifespan reduces replacement frequency for end users and lowers warranty return rates for device manufacturers and resellers
• Ultra-Lightweight at ~3g — Negligible weight addition to wrist-worn, collar-mounted, and bike-mounted devices, preserving the comfort and aerodynamics of the host product
• Low Self-Discharge Rate — Minimal capacity loss during storage ensures devices remain charged and ready after extended periods of non-use — critical for seasonal or standby-mode devices
• In Stock for Immediate Dispatch — No production queue or lead time; all standard SKUs are warehoused and available for same or next business day fulfillment

Applications

• ⌚ Smart bracelets & fitness activity trackers
• 🕐 Compact smartwatches & analog-digital hybrid watches
• 🐕 Dog training collars & remote shock / vibration trainers
• 🐾 Pet activity monitors & GPS pet trackers
• 🚴 Bicycle taillights, helmet lights & cycling safety accessories
• 🏥 Miniature medical wearables & personal health monitors
• 🌐 Ultra-compact IoT nodes & wireless micro-sensors
• 🎮 Miniature remote controls & micro RC accessories
• 💳 Smart cards & ultra-thin portable electronics

Silver Series vs Standard Grade — Performance Comparison

Compatibility

The 451820 is a universal compatible replacement and OEM supply battery for smart bracelets, watches, dog trainers, taillights, and other compact electronics utilizing a 3.7V lithium polymer cell in the 4.5 × 18 × 20mm form factor. Compatible with a wide range of consumer electronics and wearable brands using equivalent battery specifications.

⚠️ Please verify your device’s battery cavity dimensions (4.5 × 18 × 20mm) and operating voltage (3.7V) before purchasing. Connector type, wire gauge, and lead polarity vary by device — custom connector configurations are available on request to ensure drop-in compatibility.

Why Choose This Battery

• 🏭 Factory Direct Supply — Manufactured and warehoused entirely in-house for consistent batch quality, full process traceability, and competitive pricing with no intermediary cost
• ✅ In Stock & Ready to Ship — Immediate fulfillment on all standard orders with no production lead time — critical for urgent replacements and active production schedules
• 🔬 100% Pre-Shipment Testing — Every unit individually verified for capacity output, voltage accuracy, internal resistance, and PCM function before packaging and dispatch
• 🥈 Silver Series Quality Grade — Premium-tier cell consistency and capacity accuracy providing measurable performance advantages over standard commodity LiPo alternatives
• 🔧 Full OEM / ODM Support — Custom connector type, wire length and polarity, protective wrapping, PCM configuration, capacity, and private label branding available for volume production orders
• 📋 Complete Compliance Documentation — CE, RoHS, UN38.3 Test Report, MSDS, and IEC 62133 certification available to support global import, retail, and regulatory compliance requirements
• 🌍 Global Shipping Expertise — Full lithium battery hazardous goods documentation prepared in-house for seamless, fully compliant international logistics

Package Contents

• 1× 451820 Li-Polymer Battery (3.7V / 140mAh) — Silver Series
• Optional: JST-PH 1.25 / 2.0mm connector | bare wire leads | custom connector harness | protective film wrap

💡 Bulk order pricing, private label packaging, and custom OEM / ODM configurations available. Contact our sales team with your device specifications for a dedicated sample arrangement and volume quote.