As Kezo points out, these LiFePo4 batteries require a higher voltage to charge, 14.6 volts against 13.6 in my case so using a regular battery charger I can only get 70% of charge without buying a new charger. Should your battery charge inside the scooter you could find a similar outcome, should it charge outside you will require a new charger I suspect.
I eventually chickened out and went for 2 x 22amp sealed batteries, I have not used my scooter for just over 5 years since my little dog past away, I am hoping using the scooter again will be a tempory hitch until my heath improves again.
And as we speak they have just arrived.
Unfortunately I have suffered a brain injury and occasionally I get confused and often say the wrong thing.