The Samsung SDI lithium battery in the EZGO Elite uses Samsung INR18650-29E7 cells and should have a calendar life of at least 12 years.
EZGO Elite / Samsung SDI for Techies
The EZGO Elite has a bit of a stiff ride that can be mitigated by keeping tire pressure below 18 PSI. It does feel a little tippy in corners...the motor brakes are excellent with no pads to wear out.
The 2004 Prius has a nickel metal hydride battery...Not lithium.