Yes the EVO 36 Volt 1000 Watt electric scooter's lead acid batteries can be replaced with lithium batteries. We carry 12 Volt 12Ah lithium batteries that are the exact same size as the original batteries. These batteries are our item # BAT-LIF12V12AH which are available on this page: https://electricscooterparts.com/lifepo412v-24vbatteries.html
These lithium batteries have push-on terminals and the scooter's original may have bolt-down terminals in which case 1/4" wide push-on terminals could be installed on the original battery wiring harness, or a new battery wiring harness that has push-on terminals item # HNS-EVO36V-TA could be purchased on this page: https://electricscooterparts.com/batteryharnesses.html
Please let us know if you have any questions.
Yes that is correct. Three item # BAT-LIF12V12AH are required for the battery pack.