High Quality 7.4V Li-Ion Battery Pack 4000mAh-7000Mah Large Capacity 2S2P Xh2.54

Nominal voltage V: 7.4 Charging voltage V: 8.4V Battery type: cylindrical lithium battery Combination mode: 2S2P Name: Rechargeable lithium battery pack Model: 7.4 2S2P (horizontal) Rated capacity: 4000-7000 (Mah) Cell type: 18650 lithium battery

eBay