It looks like a derivative of the Fastin / Faston 6.35mm receptacle housing (at least it looks like 6.35mm) but there are many makers and one maker's product won't usually fit another. If there are any markings moulded into the plastic, that might narrow down the maker. E.g. Tyco / AMP / JST and a bunch of others.
One solution is to simply push two 6.35mm blade terminals into the sockets. But, there is another problem which is that not all such connectors are designed for repeated insertion & removal. Some have a rated life of 50 insertions or so, after which they don't make good contact. My solution would be to leave that attached to the scooter and put a high current, low resistance connector of a readily available type between that and the battery. I use Amass XT60s for this purpose and find them ideal, the Anderson PowerPole and EC5 are other popular choices.