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Lithium Polymer Battery
Created with Pixso. 302030 3.7V 140mAh Li Polymer Battery Custom Lithium Ion Battery Cell

302030 3.7V 140mAh Li Polymer Battery Custom Lithium Ion Battery Cell

Brand Name: VATS Battery or Neutral
Model Number: 302030
MOQ: 10
Price: $0.94-1.5
Delivery Time: 7 work days
Payment Terms: T/T
Detail Information
Place of Origin:
Guangdong, China
Certification:
UL1642//UL2054/CB/KC/PSE/CE/ROHS/UN38.3/MSDS
Battery Size:
3.0±0.2*20±0.5*30±2.5mm
Discharge Rate:
0.5C
Capacity:
140mAh
Max Charge Voltage:
4.2V
Voltage:
3.7V
Cycle Life:
500 Charge Cycles
Packaging Details:
Industrial cartons compliant with air & sea shipping standards
Supply Ability:
Ships in 7 Business Days (In-Stock) / 30 Business Days (Out-of-Stock)
Highlight:

3.7V 140mAh lithium polymer battery

,

custom lithium ion battery cell

,

302030 Li polymer battery with warranty

Product Description
302030 3.7V 140mAh Li Polymer Battery Custom Lithium Ion Battery Cell
Product Overview

This compact li polymer battery delivers steady 3.7V power for small electronics. It is a practical 3.7V wearable device battery with stable output, ideal for compact smart gadgets. We support sample testing and custom lithium ion battery cell configurations to match your project needs.

Technical Specifications
Item Details
Model 302030
Cell Type Lithium polymer battery
Dimension 3.0±0.2*20±0.5*30±2.5mm (Thickness*Width*Length)
Nominal Capacity 140mAh (120mAh optional; custom size/capacity/voltage available)
Nominal Voltage 3.7V
Max Cutoff Voltage 4.35V
Standard Discharge Current 0.2C–0.5C
Max Discharge Current 1C
Connector JST / Molex, customizable
Cycle Life 500 charge-discharge cycles
Packaging Industrial carton, compliant with air & sea shipping standards
Key Advantages
Stable Power Output for Mini Electronics
Controlled 0.2C–0.5C standard discharge, peak 1C protects your device mainboard and maintains consistent operation.
Long Service Life to Lower Replacement Cost
Rated for 500 cycles to reduce recurring component costs for your finished products.
Custom Connector & Specs
JST/Molex optional, plus custom size, capacity and voltage for smooth hardware integration.
Factory Supply With Sample Support
Direct manufacturer supply with sample testing available to validate performance before mass production.
Compliant Shipping Packaging
Carton packaging follows international air and ocean standards to reduce customs hold-up risk.
Applications

This 3.7V wearable device battery fits many compact consumer and smart electronics for home, commute and outdoor use:

Car Recorders GPS Navigators Smart Home Appliances Massagers Digital Cameras Sprayers Dental Rinsers Smart Bracelets Blackhead Removers Remote Controls Smart Watches Electronic Toy Guns Electric Air Pumps Smart Trash Cans Bluetooth Speakers Fingerprint Locks Electric Hair Clippers Dog Trainers Pest Repellents Camping Lights Robot Vacuums Electric Toothbrushes Pet Water Fountains Electric Shavers Mini Handheld Fans
Frequently Asked Questions
Is this li polymer battery compatible with my small wearable device?
It is a 3.7V wearable device battery made for low-current compact electronics. Confirm your device voltage, size and connector pinout before ordering. We also provide custom lithium ion battery cell if standard 302030 does not fit.
Can I order samples for testing?
Yes, sample testing is supported so you can verify performance before bulk purchase.
What is the production lead time?
Stock items ship within 3–7 days. Custom orders take 2–3 weeks after confirmation.
Can I change the connector or adjust capacity?
Yes. We offer JST/Molex connector selection and custom size, capacity and voltage for your project.
How many cycles can this battery last?
It supports up to 500 charge and discharge cycles under proper use.
Does the packaging pass air and sea lithium transport rules?
Yes. Our industrial carton packing meets international air and shipping standards for lithium cells.
What is the maximum discharge current of this lithium ion battery cell?
The maximum discharge current is 1C, standard discharge range is 0.2C–0.5C.
Are you the direct manufacturer?
Yes. VATS BATTERY is a professional lithium battery manufacturer based in China for stable factory direct supply.
After-sales Guarantee

We stand behind our li polymer battery for small electronics. All cells go through basic quality checks before packing. Reach out to our technical support team quickly if you meet product matching or performance issues. We maintain clear communication for custom spec adjustment, sample arrangement and bulk order scheduling. Our packaging follows international lithium shipping rules to help your cargo clear customs smoothly. We offer responsive support to resolve compatibility questions for your 3.7V wearable device battery and custom lithium ion battery cell requests.

Ratings & Review

Overall Rating

5.0
Based on 50 reviews for this supplier

Rating Snapshot

The following is the distribution of all ratings
5 stars
100%
4 stars
0%
3 stars
0%
2 stars
0%
1 stars
0%

All Reviews

M
Markus K.
Germany May 15.2026
Ich war anfangs echt ein bisschen skeptisch, weil man im Netz ja viel zu hören bekommt, wenn es um Li-Polymer-Akkus geht. Aber der originale E66 Akku hier? Junge, Junge... das Teil ist ein Biest! Ich habe die Zelle jetzt seit ein paar Wochen in meinem DIY-Solar-Projekt verbaut und ausgiebig getestet. Was soll ich sagen: Die 66ah sind absolut real, kein Fake-Wert! Die Kapazität ist stabil, die Spannung von 3.7V bleibt auch unter Last super konstant und das Teil wird beim Laden kaum handwarm. Man merkt einfach sofort, dass die Verarbeitungsqualität stimmt und das PCB-Schutzboard ordentlich mitgedacht wurde. Für den Preis kriegt man hier in Deutschland aktuell kaum was Besseres. Versand war auch fix, Verpackung war bombensicher – so muss das laufen! Wer verlässliche Power sucht, kann hier echt bedenkenlos zugreifen. Von mir gibt's eine klare Kaufempfehlung und verdiente 5 Sterne. Daumen hoch!
O
Owen
Canada Apr 7.2026
I’ve been using this 357090 3.7V 2500mAh lipo battery for a few weeks now, and I’m really satisfied with it. It is steady-quality rechargeable lithium polymer batteries that perfectly match the rated voltage and capacity. Output efficiency is great, which helps me save a lot of working time. Build quality feels solid too, no weird noises or faults during daily operation. Shipping was fast and the packaging was protective. For small-scale battery production and copying work, this is absolutely a practical and cost-effective pick. I’d definitely recommend it to fellow business partners and will consider reordering in the future.
H
Harry
United Kingdom Mar 18.2026
I bought these 805050 3.7V 2500mAh lithium polymer batteries to replace the old cells in my Bluetooth speakers, and they work brilliantly. Fit is absolutely perfect, no trimming needed at all. The voltage and capacity are spot on, my speakers now hold charge for much longer than before. Power output is stable, sound quality isn’t affected one bit. They’re well-made and feel really durable. Delivery arrived quickly, items were well packed with no damage. Great value for money compared to local stores. I’ve been using them daily for weeks with zero issues. Would absolutely recommend these batteries to anyone needing replacements for wireless speakers. I’ll be coming back to buy more soon!