This is a 9V battery clip typically used for our wireless cameras. The ID is 2.1mm, the OD is 5.5mm. Center positive.
9V Battery Snap with 12" Leads
This is a Pre Built direct drive 4WD base Programmable robot kit that uses Nexus mecanum wheels and hubs. Its a Arduino robot platform for indoor robotics. It can vector in any direction.
The Power Patrol SLA1165 battery is sized, tested and rated to meet exact manufacturer, OEM and safety standards. The SLA1165 gives you increased durability, superior performance, longer run times between charges and longer overall battery life.