I've got an ET.CYCLE T1000 which I thought had the same battery as your Moscow, so I did some research,..
My ET.CYCLE is also available as a folder, the F1000.
The folder uses the DeHawk charger, which appears to have a different connector, but the chargers are virtually identical.
This is what NCM shows as the battery for the Moscow,..
My 1000 WH battery only has a 3 amp charger. My 1200 WH battery has a 4 amp charger, and the charging port starts getting kinda hot at four amps. Your connector might be able to handle 4 amps better, but I don't think that it's a good idea.
Unless it's really important to you to charge faster, then a slower charge is always better especially with your 7 yr old battery.
You'll wear it out a lot quicker with a faster charge, and it may not be safe?
This is my battery and charger,..
The battery has the same i5 labeling as your DeHawk. (Whatever that means?)