High Power Polymer Li-Ion Cell: 3.7V 4000 mAh (6050140-10C) 14.8Wh, 40A rate - UL Listed / UN38.3 Passed (NDGR)
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AKKU 22707: Li-ion battery, 21700, 3.7 V, 4000 mAh, includes MicroUSB chargi at reichelt elektronik
3.7V 4000mAh Li Po Polymer Lithium Rechargeable Battery For Tablet PC Power Bank GPS PAD DVD Laptop Notebook 5044147|Rechargeable Batteries| - AliExpress
Wholesale Rechargeable Lipo Battery For Power Bank UFX 824577 4000mAh 3.7V li-Polymer Battery With Wire