This is the extended range removable second battery for the Cooler Kub 750S and 2025 Cooler Kub 250S.
It’s a bit bigger than the standard battery, giving you even more miles, can be fitted in the upper 'fuel tank' or clipped in on the lower part of the frame and is compatible with the new style 3 pin port charger.
It's lockable and comes with a pair of keys.
48v - 20aH - extended range.