Voltage: DC 3.7V Capacity: 28mAh Material: Lithium PolymeDimension (L x B x H) in mm : 0.9 mm x 0.8 mm x 0.4 mm NOTE: These batteries don’t have protection circuitry inbuilt. Use a separate protection, We don’t guarantee the accuracy of the size mentioned, Print on the battery may also vary with every lot.