Ecer asks for your consent to use your personal data to:
Personalised advertising and content, advertising and content measurement, audience research and services development
Store and/or access information on a device
Your personal data will be processed and information from your device (cookies, unique identifiers, and other device data) may be stored by, accessed by and shared with 135 TCF vendor(s) and 65 ad partner(s), or used specifically by this site or app.
Some vendors may process your personal data on the basis of legitimate interest, which you can object to by do not consent. Contact our platform customer service, you can also withdraw your consent.
Your message must
be between 20-3,000 characters!
Submit Requirement
Thank You！
Your requirement has been sent. we will contact you quickly!
{"title":"303040 3.7V 300mAh Li Polymer Battery CE Certified For Smart Watch","imgUrl":"https:\/\/img.chinax.com\/nimg\/6d\/5c\/1ef8aef521d34ba517bd83513b37-200x200-1\/303040_3_7v_300mah_li_polymer_battery_ce_certified_for_smart_watch.jpg","attrs":{"Supply Ability":"Ships in 7 Business Days (In-Stock) \/ 30 Business Days (Out-of-Stock)","Model Number":"303040","Battery Size":"3.0\u00b10.2*30\u00b10.5*40\u00b12.5mm","Payment Terms":"T\/T"}}
{"title":"80Ah 3.7V Large Format NCM Pouch EV Lithium Ion Power Battery Pack","imgUrl":"https:\/\/img.chinax.com\/nimg\/34\/f6\/ffc70a6de2c75824182ae4676f0c-200x200-1\/80ah_3_7v_large_format_ncm_pouch_ev_lithium_ion_power_battery_pack.jpg","attrs":{"Model Number":"80AH","Capacity":"80000mAh","Payment Terms":"T\/T","Supply Ability":"In stock: 7 working days\/Out of stock: about 30 working days"}}
{"title":"76Ah 3.7V Large Format NCM Pouch EV Lithium Ion Power Battery Pack","imgUrl":"https:\/\/img.chinax.com\/nimg\/00\/8e\/8f684edb23296a309ff612607b17-200x200-1\/76ah_3_7v_large_format_ncm_pouch_ev_lithium_ion_power_battery_pack.jpg","attrs":{"Model Number":"76AH","Cycle life":"800 Times","Supply Ability":"In stock: 7 working days\/Out of stock: about 30 working days","Brand Name":"VATS Battery"}}
{"title":"53Ah NCM Pouch Cell 3.7V EV Pouch Lithium Ion Power Battery Pack For Energy","imgUrl":"https:\/\/img.chinax.com\/nimg\/30\/6c\/0b3ee9817139e5abac8c6aa85e22-200x200-1\/53ah_ncm_pouch_cell_3_7v_ev_pouch_lithium_ion_power_battery_pack_for_energy_storage_ev.jpg","attrs":{"Supply Ability":"In stock: 7 working days\/Out of stock: about 30 working days","Model Number":"53AH","Dimensions":"10x161x231mm","Minimum Order Quantity":"10"}}
{"title":"3.7V NCM Pouch Power Battery Pack 46Ah EV Lithium Ion Pouch Cell For E-Bike","imgUrl":"https:\/\/img.chinax.com\/nimg\/86\/df\/e32d370f24dd06f1a8951172567e-200x200-1\/3_7v_ncm_pouch_power_battery_pack_46ah_ev_lithium_ion_pouch_cell_for_e_bike.jpg","attrs":{"Supply Ability":"Ships in 7 Business Days (In-Stock) \/ 30 Business Days (Out-of-Stock)","Brand Name":"Vats Battery","Dimensions":"10\u00b10.2mm * 161\u00b10.5mm * 227\u00b10.5mm","Place of Origin":"China"}}
{"title":"20Ah 3.7V 10C High Discharge Lithium Polymer Battery For Medical Outdoor Devices","imgUrl":"https:\/\/img.chinax.com\/nimg\/60\/6a\/15ed965209db6166bd1d96405267-200x200-1\/20ah_3_7v_10c_high_discharge_lithium_polymer_battery_for_medical_outdoor_devices.jpg","attrs":{"Supply Ability":"In stock: 7 working days\/Out of stock: about 30 working days","Model Number":"20AH","Operating temperature":"20\u00b0C-60\u00b0C","Minimum Order Quantity":"10"}}
{"title":"3.7V 700mAh Li Polymer Battery 603040 Rechargeable Lithium Ion Cell For GPS","imgUrl":"https:\/\/img.chinax.com\/nimg\/c3\/ad\/1f95d62772bb3c7afad6eb3830bd-200x200-1\/3_7v_700mah_li_polymer_battery_603040_rechargeable_lithium_ion_cell_for_gps_tracker.jpg","attrs":{"Cycle Life":"500 cycles","Model Number":"603040","Payment Terms":"T\/T","Supply Ability":"Ships in 7 Business Days (In-Stock) \/ 30 Business Days (Out-of-Stock)"}}
303040 3.7V 300mAh Li Polymer Battery CE Certified For Smart Watch
This compact li polymer battery delivers steady 3.7V power for small wearable gadgets. As a reliable lithium ion battery cell, this 3.7v wearable device battery fits tight housings of smartwatches and portable electronics with stable output.
Compact Form Factor: Thin 303040 footprint saves internal device space while maintaining stable power supply
Reliable 500-Cycle Service Life: Consistent performance over repeated charge cycles for longer usable time
Customizable Connectors & Capacity: Choose JST or Molex connectors, or request tailored sizes to match your hardware design
CE Certified & Shipment Compliant: Passes CE safety tests and meets international air & ocean shipping standards
Manufacturer Direct Supply: No middle markup with sample support available for verification before mass production
Applications
This 3.7V wearable device battery powers a wide range of compact consumer and smart electronics including smart watches, smart bracelets, car recorders, GPS navigators, smart home appliances, massagers, digital cameras, sprayers, dental rinsers, blackhead removers, remote controls, electronic toy guns, electric air pumps, smart trash cans, Bluetooth speakers, fingerprint locks, electric hair clippers, dog trainers, pest repellers, camping lights, robot vacuums, electric toothbrushes, pet water fountains, electric shavers, and mini handheld fans.
Frequently Asked Questions
Can I get samples of this li polymer battery for testing?
Yes, sample testing is supported to validate the 3.7V wearable device battery with your circuit design.
What is the standard lead time for bulk orders?
2–3 weeks for custom orders; 3–7 days for in-stock items.
Can I change capacity, dimension or connector?
Custom size, capacity and voltage are available, including JST/Molex connector selection.
What cycle life can I expect from this lithium ion battery cell?
Rated for 500 charge-discharge cycles under standard discharge conditions.
Is this battery CE certified for export?
Yes, it carries CE certification, and packaging meets international air & sea transport rules.
What is the max continuous discharge rate?
Maximum discharge current reaches 1C; standard working discharge range is 0.2C–0.5C.
What is the maximum cutoff charging voltage?
4.35V, please use matched charge management board to avoid overcharging.
After-sales Guarantee
We provide manufacturer-backed support for this li polymer battery. All units go through pre-shipment inspection and hold CE certification. If quality issues occur under normal use, we coordinate replacements or solutions quickly. Our technical team supports your hardware integration questions. We follow international shipping standards for safe global delivery of this lithium ion battery cell.
