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Rechargeable Lithium Polymer Battery

Rechargeable Lithium Polymer Battery

Rechargeable Lithium Polymer Battery

Product Details:

Place of Origin: MADE IN CHINA
Brand Name: DELONG
Certification: MSDS, UN38.3
Model Number: DL-330819

Payment & Shipping Terms:

Minimum Order Quantity: 500
Packaging Details: White Box
Payment Terms: T/T, Western Union, Paypal, Cash
Supply Ability: 10000 piece per day
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Detailed Product Description
Capacity: 50mAh Model: 330819
Nominal Voltage: 3.7V Type: Li Polymer
Business Type: Manufacturer Discharge Cut-off Voltage (V): 2.75v
Max. Discharging Working Current: 2C Storage Temperature: -10°C~ +45 °C

330819 3.7v 50mAh Rechargeable Flat Lithium Polymer Battery for Fitness Wristle Watch 








3.7V Battery


Nominal Voltage




Charging Voltage




Nominal Capacity






Thickness × Width × Length (mm)



10.0±0.2×50±0.5×80±0.5 (with PCM)



High energy density, good capacity, light and thin, safe

and reliable(with PCM) , long circle life, no memory,environmental, table performance, capacity and size could be customerized.


Max Charge Current




Charging Method


Charge with constant current 1C to 4.2V,then charge with constant voltage 4.2V till charge current less than 0.01C


Max discharge current




Discharge cut-off voltage




Charing Current


Standard Charging:0.5C Rapid charge:     1.0C


Standard Charging method


0.5C CC(constant current)charge to 4.2V, then CV(constant voltage 4.2V)charge till charge current decline to ≤0.05C


Operating environment


Charging, 0°C ~ 45°C ; 65±20%RH

Discharging, -20°C~60°C ; 65±20%RH

Storage environment




Storage for a long time(>3 months) and the storage condition shall be:<35°C;65±20%RH;3.7~3.9V





1. According to item 4.1.1, at 23±5℃.

2. Capacity comparison at each temperature, measured with constant discharge current 0.2C with 2.75V cut-off.Percentage as an index of the capacity compared with 100% at 23℃

Criteria:-20℃: ≥65%

23℃: 100%

80℃: ≥95%






1, Longer storage life than NiMH Batteries

2, Light weight and higher energy density than any rechargeable battery

3, Installed IC chip will prevent the battery pack from over charge and over discharge.

It helps protect battery chemistry integrity and prolongs battery life.

4,Perfect for building up battery pack for medical equipment Back-up or UPS Emergency Power

5, Supply which requires compact size and lighter weight

6, The battery module is wrap by PVC

Main application:




3C digtal products: Computer / Camera /Labtop...

Electronic vehicle;

Led lighting;

Portable small home appliance;

medical apparatus equipment;

electric tools ; 

toys , etc.





  • High energy density
  • High working voltage for single battery cells
  • Pollution-free
  • Long cycle life
  • No memory effect
  • Capacity, resistance, Voltage, platform time consistency is good
  • With short-circuit production function, safe and reliable
  • Factory price& High quality
  • Good consistency, low self discharge
  • Light weight, small size



Package and shipping:


Optional package: Color paper box, PVC box, Cases, Transparent crystal cases, white netraul box.
Carriers: By express: Like DHL, UPS, FedEx; by air or by sea; Special line



How to place order:


1. Please kindly advise the items, quantity and other detail request about your order
2. After proforma invoice confirmed, the order will be arranged upon receipt of your deposit payment.
3. Confirm and ship the goods , the tracking number will be sent to your promptly
4. Our sales representative will help to tack your goods until you receive them well.
5. we will send  customer satisfaction survey form to you ,appreciated get feedback from you about the quality, service, market feedback
and others


Company Information:


Establised since 2006, Delong Energy Technologgy Co.,LTD is a modern enterprise, which specialized in new products researched and development, sales and trade. Delong Energy Tech has 2 business line, one is for finished product, another area is semi-finshed product.
And the main products includes:  Power Bank, Li-ion battey cell and pack , Li-polymer cell and pack etc.


Welcome to contact us for further details about our company and products!


Contact person: Jenny
Mobile:  +86 136 0302 8413
Wechat: +86 13603028413






Why choose us?



Focus on Batteries industry 15 Years



25 professional engineers who has worked with us more than 10 years now


Full Equipments

Full automatic machine:  20 sets plastic injection machines, 1 large batteries aging test centre,  1 independent R&D office site.


Good Service 

one stop serive from housing, PCBA, batteries, assembling, package shipping. 



Competitive price make you profit maximization



OEM and ODM can be acceptable


Quality Control

Best quality contral, the defective rate is within 0.01%





Q1:  How fast can i get the quotation ?


A: We usually quote within 24 hours after we get your inquiry. If you are very urgent to get the

     price, please call us or tell us in your email so that we will regard your inquiry priority. 


Q2:  How long will it take to deliver goods?


A: We will deliver the goods within 3- 5 days for spare parts, other goods maybe take a little 

     more times to test and prepare,we will deliver the goods within the deadline which both

     parties agreed.


Q3:  What kind of packaging you offer?


A: Color window box, Plastic box,Blister Package, White box, Gift box,Tin box, Glass Box, 

     ECO-package etc. OEM package is available !


Q4:  What kind of logo files do you accept for printing logo ?


A: PDF, Core Draw, AI .


Q5:  How can I get a sample to check your quality? 


A: Generally speaking, Free sample is available. While some samples need to pay, But the 

     sample cost can be refundable after order confirmation

Contact Details
Shenzhen Delong Energy Technology Co.,LTD

Contact Person: Ms. Iris

Tel: 86-755-61186759

Fax: 86-755-33815254

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