Liitokala 2x 18650 4000mAh 3.7V Protected Lii-400018.90Buy!£Onbuy.comDelivery: in United Kingdom ReportBattery: 18650 Nominal Voltage: 3.7V Nominal Capacity: 4000mAh Type: Li-ion, INR, Rechargeable Battery Size : Ø18.5mm x 68 mm Min.