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Features 100% Brand new ! Premium 3393104 3.7V, 4000mAh rechargeable Li-Po battery. High quality and durable, with large capacity of 4000mAh, less worry about battery's going dead within a short time. Provides excellent continuous power sources to your device, features high energy density and extra long lifespan. Built-in smart protective PCB charging module, effectively prevents over charging, over discharging, over current and short circuit. Widely used for tablet,  laptop, game player, E-book, portable printer, DVD, MID, PAD, PDA, solar lamp, electric toys, medical equipment or other compatible devices powered by batteries with the same size and capacity. Portable emergence backup power, ideal batteries for DIY lovers ! Specifications Model: 3393104 Type: Lithium battery Capacity: 4000mAh Rechargeable: YES Charging Voltage: 4.2V Rated Voltage: 3.7V Dimensions(L*W*H): About 104x93x3.3mm   Attentions 1. Please allow tiny size deviations due to human measurement. 2. Make sure your device's battery space before you bid, we prefer you purchase a smaller size battery. 3. When the battery is not in use, it should be removed from the device. 4. The red and black lines should not be connected to avoid short circuit after battery is charged.