Neoware 4400 mAh 7 V Rechargeable Lithium-ion Pack (3.6 cm * 3.6 cm * 6.5 cm) Battery - Neoware : Flipkart.com
Amazon.com: 1Pcs 18650 3.7v 4400mAh 1S2P Li ion Rechargeable Battery Pack with 2.0Pin JST-PH Connector 16.28Wh/4.4A, Blue, 6.6 x 1.8 cm (19.28Wh/4.4A) : Health & Household