I saw this tonight, 38.4V 60AH / 2.3KWhr Lifepo4 battery sale - Already
built, internal BMS. Surplus never used overstock. Might be worth
taking a look at, if you are needing batteries. The spec sheet is on
the page. 2 or 3 of these paralleled would work well in an ET.
https://batteryhookup.com/products/new-38-4v-67ah-2-57kwh-lifepo4-battery-with-bms-36v
I converted mine to Lion a couple years ago, using these would be a lot
simpler.
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