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KallistaI'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!
3.7V 290Mah Lithium Ion Polymer Power Bank Lipo Battery For Power Bank

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Whatsapp:0086 18588475571
wechat: 0086 18588475571
Skype: sales10@aixton.com
If you have any concern, we provide 24-hour online help.
xType | Li-polymer | Size | 4.5*30.5*48.5 (mm)Max |
---|---|---|---|
Max Charge Voltage | 4.2V | Discharge Cut Off Voltage | 2.75V |
Standard Charge Current | 0.2C | Max Charge Current | 290mAh |
Charging Mode | CC/CV | Charging Temperature | 0~45℃ |
Discharging Temperature | -20 ~ 60℃ | Warranty | 12 Months |
Port | Shenzhen/Hongkong | ||
Highlight | 3.7V Lithium Ion Polymer Power Bank,290Mah Lithium Ion Polymer Power Bank,290Mah Lipo Battery For Power Bank |
Attribute | Value |
---|---|
Type | Li-polymer |
Size | 4.5*30.5*48.5 (mm)Max |
Max charge voltage | 4.2V |
Discharge cut off voltage | 2.75V |
Standard charge current | 0.2C |
Max charge current | 290mAh |
Charging mode | CC/CV |
Charging Temperature | 0~45℃ |
Discharging Temperature | -20 ~ 60℃ |
Warranty | 12 Months |
Port | Shenzhen/Hongkong |

ODM/OEM services available for this 3.7V 290Mah Li-Ion Polymer Rechargeable Battery.
- Top 10 battery supplier in China with competitive pricing
- Comprehensive battery product range available
- Strict quality control processes ensure product reliability
- Additional advantages available upon inquiry

- Professional: 20 years of battery pack design and production experience
- Factory Direct: High-quality product packaging and PCB/BMS solutions
- Quality Certified: ISO 9001 and ISO 14001 certified manufacturing
- Custom Solutions: OEM & ODM services with top 500 enterprise recognition
- Service Excellence: Comprehensive technical and after-sales support

Shenzhen BAK Technology Co Ltd specializes in rechargeable battery pack design and production with 20 years of experience. Our advanced R&D capabilities and production facilities enable us to deliver high-quality battery packs and PCB/BMS solutions worldwide, supported by excellent technical service and after-sales support.



Safety is paramount in battery usage. We use qualified battery cells, full-function PCB/BMS, and maintain strict quality control procedures to ensure reliable products.
Customized batteries including 18650/21700/26650/32700 models, Lifepo4 3.2V-100Ah/150Ah/200Ah/277Ah, and 12.8V100Ah/120Ah/12Ah/6Ah configurations.
Standard 12-month warranty (negotiable for special products). We provide pre-production samples and conduct final inspections before shipment.
No minimum order quantity. Sample orders are welcome to test quality before bulk purchases.
Yes, our professional R&D team can develop solutions according to your requirements, including logo printing.
Sample orders: 1-3 weeks. Bulk orders: 4-8 weeks depending on model and quantity.
Options include express (1-2 weeks), air (2-3 weeks), sea (20-60 days), or train (30-45 days). Customer shipping agents are acceptable.
We provide tracking numbers upon shipment and monitor production until delivery.
Contact us for current pricing, packaging options, shipping details, discounts, and customized battery solutions.
