The characters on the battery case label translate to: "Caution label. Special Lithium Battery for scooter."
We are not familiar with the lithium battery pack in your photo so we are not able to recommend a specific charger for it. Lead-acid battery chargers should not be used on lithium battery packs. Not sure where to get a similar battery pack. Lithium charger output Voltages correspond to the type and number of cells in the battery pack. This is why we can not recommend a charger for it because we do not know the type and number of cells that it is made with.
Since we can not determine what battery charger is compatible with that battery pack our best advice is to not use it and get another battery pack which includes a battery charger or which a battery charger can be matched to.
The most important specifications to match up are the controller's current limit and the lithium battery pack's maximum continuous current rating. The battery's maximum continuous current rating needs to be the same or a little higher than the controller's current limit, which is sometimes called maximum current on controller specifications.
Unfortunately, we do not have a battery pack that is close to the one which you attached.