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  • Shenzhen BAK Technology Co., Ltd.
    Kallista
    I'm going to keep this sweet & short! I have never experienced such excellent customer service with a out of country supplier. This company has gone far and beyond to meet the needs of their customers. Their response time with all my concerns were addressed immediately 100%within 1-24 hours and the shipping time was EXCELLENT!
Contact Person : Dong
Phone Number : +86 13828713564
Whatsapp : +8613828713564

3.7V 350mAh LP-422339-PACK Li-Polymer Battery for Smart Wearables & IoT Devices

  • 3.7V 350mAh LP-422339-PACK Li-Polymer Battery for Smart Wearables & IoT Devices
  • 3.7V 350mAh LP-422339-PACK Li-Polymer Battery for Smart Wearables & IoT Devices
  • 3.7V 350mAh LP-422339-PACK Li-Polymer Battery for Smart Wearables & IoT Devices
  • 3.7V 350mAh LP-422339-PACK Li-Polymer Battery for Smart Wearables & IoT Devices
  • 3.7V 350mAh LP-422339-PACK Li-Polymer Battery for Smart Wearables & IoT Devices
Place of Origin Dongguan China
Brand Name BAKTH / Neutral / OEM
Model Number LP-422339-PACK
Minimum Order Quantity 2 Piece
Packaging Details 1pc/individual
Delivery Time 35~45 days
Payment Terms T/T
Supply Ability 1000PCS/Month
Product Details
Type Li-pol Battery Model NO. LP-422339-PACK
Nominal Voltage 3.7V Nominal Capacity 350mAh
Power Capacity 1.3Wh Max. Charging Voltage 4.2V
Discharge Cut-off Voltage 2.8V Dimension Approx 4.4*24*40.5 Mm
Weight Approx 8.8g Sample Available
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3.7V Li-Polymer battery for wearables

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350mAh IoT device battery pack

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LP-422339-PACK rechargeable battery
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Product Description
3.7V 350mAh LP-422339-PACK Li-Polymer Battery for Smart Wearables & IoT Devices


The LP-422339-PACK is a premium lithium-polymer (Li-Pol) battery engineered for small, power-efficient electronics, featuring a slim prismatic form factor (42mm × 23mm × 3.9mm), nominal 3.7V voltage (4.2V full charge), and 350mAh capacity—delivering 1.295Wh of reliable energy. Designed with Li-Pol’s signature flexible, thin profile, this battery merges space-saving design, lightweight construction, and stable performance, making it the ideal power source for wearables, mini IoT sensors, portable medical devices, and compact consumer gadgets that demand tiny, long-lasting power.
Core Advantages of Pouch Li-ion Design​
Crafted to solve the unique needs of miniaturized devices—where size and weight are critical:​
  • Ultra-Slim & Flexible Design: With a thickness of 4.4mm and prismatic shape, the LP-422339-PACK fits seamlessly into ultra-compact devices like wireless earbuds, smart hearing aids, mini fitness trackers, and micro IoT beacons. Its flexible Li-Pol structure adapts to tight, irregular spaces (unlike rigid cylindrical batteries), enabling sleeker, more ergonomic product designs for modern gadgets.​
  • 350mAh Targeted Capacity: Optimized for low-power devices, delivering balanced runtime: powering a pair of true wireless earbuds for 4-6 hours of continuous playback, a mini smartwatch for 2-3 days (basic features), a small IoT temperature sensor for 2-4 weeks (low-frequency data transmission), or a portable glucose meter for 10-15 uses. Perfect for devices where every millimeter and gram counts.​
  • Stable 3.7V Voltage Output: Maintains consistent 3.7V nominal voltage throughout discharge, avoiding the voltage drops that cause glitching, reduced functionality, or sudden shutdowns in sensitive small electronics. This stability is critical for precision devices like medical wearables or sensor modules, ensuring accurate performance until full depletion.​
  • Featherweight Construction: Weighing only 8.8g, it adds virtually no bulk to mini gadgets—essential for wearables that need to be lightweight and comfortable for all-day use. Its flat, compact profile maximizes space efficiency, allowing manufacturers to create thinner, more discreet devices.

Ideal For:
  • Wearable Technology: True wireless earbuds, smart hearing aids, mini fitness trackers, and compact smartwatches.
  • IoT & Sensors: Micro Bluetooth beacons, environmental monitoring sensors (temperature/humidity), and small GPS trackers.
  • Portable Medical Devices: Mini glucose meters, portable pulse oximeters, and small health monitors.
  • Compact Consumer Gadgets: Mini LED flashlights, portable keychain speakers, and tiny handheld game consoles.
  • DIY & Custom Projects: Small drones (micro models), Arduino-based gadgets, and custom wearable prototypes.

3.7V 350mAh LP-422339-PACK Li-Polymer Battery for Smart Wearables & IoT Devices 0

 

About Us

Shenzhen BAKTH Technology Co., Ltd. was established in 2002. For 21 years, we've specialized in battery pack assembly and PCM/BMS design and production. Our 5,000-square-meter factory features automated production lines and SMT assembly capabilities.

3.7V 350mAh LP-422339-PACK Li-Polymer Battery for Smart Wearables & IoT Devices 1
Certifications

3.7V 350mAh LP-422339-PACK Li-Polymer Battery for Smart Wearables & IoT Devices 2


FAQ
What kind of certificate your battery pack owned?

ISO9001, ISO14001, UL, BIS, KC, USTC, CE, CB - our battery packs have reliable quality assurance.

Do you have MOQ?

No limitation - we offer competitive pricing based on order quantity. Sample orders are welcome to test our quality before bulk orders.

What's the warranty? How can we guarantee quality?

Standard warranty is 12 months (negotiable for special products). Our complete production process ensures quality before shipment.

What's the lead time?

Standard products: 3-4 weeks for samples (depending on cell availability), 5-8 weeks for bulk orders (varies by model and quantity).

Can we have our own Logo on the battery pack? Can you accept customized battery?

Yes - our professional R&D team can provide customized solutions according to your requirements.

Tags:

lipo battery pack

li poly rechargeable battery pack

li polymer battery cell