[Hersbird]

https://batteryhookup.com/collections/lithium-ion-assembled-battery-modules/products/10-pack-32-85v-2890mah-94-93wh-lithium-ion-batteries-with-bms-and-fire-proof-case-9s
Buying 2 sets of these 10 packs would be under $450 which was quite a bit less than the similar number of watt hours I bought for my Ebike build. I think my 52 volt 14 amp hour pack was like $550. These could be a 72 volt 24 amp hour battery for $450.