7.4V Cylindrical lithium battery product model: XL 7.4V 6400mAh 7.4V Cylinder lithium battery technical parameters (specific design according to customer requirements - voltage / capacity / size / line) Single battery model: 18650 Packaging method: Industrial PVC heat shrinkable film Wire model: Black and red wire UL3239 20AWG, yellow and blue wire UL3239 26AWG