John Deere ez to ev conversion

I converted my John Deere EZtrak 225 to EV using motenergy me1004 48v with 4 lipo4 last fall. Installed a a fuse link to main switch to contactor to the motor. Another line to 48v-12v to the control panel (utilized the ignition and pto) uses the existing belt to hydro and belt to drive the blades through pto, even added a fog light and tail lights. Everything were good, cuts about 2 acres in 1 full charge.. This spring it cut about 30 minutes and it shutdown, charged it full with smart charger on repair mode, and it only ran for 5 minutes. Charged it again and only jerked, it jumped and died, make the story short the lipo4 batteries failed to hold charge. Luckily the vendor with the help of Amazon refunded the full amount. Now i am trying to get agm batteries, but waiting maybe someone here uses something better.

I have the builds video in youtube under John Deere EV Conversion

What brand / capacity were the LFpo4 batteries that failed ?
Most of the cheap 12v, 100ah batteries are not really up to use as traction packs

Sounds like a perfect candidate to build a battery from a battery or modules from an electric car or plug in hybrid for.
Dosent even have to be a very modern one, as size or weight isnt a big consern.