I-Birds Enterprises Mini 3.7V high quality 30 mAh Rechargeable Lipo for earphone, buds etc. Battery(Pack of 4)
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Capacity: 30 mAh Capacity battery with Voltage: 3.7 Volts Cell, mini lithium polymer battery, battery size 4*8*8mm, weight 1gram, The charging ratio 0.2C, type Li-polymer, Capacity 30mAh for Wireless Earphone Earbuds Hearing Aids.
