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ECO-WORTHY via AliExpress has ECO-WORTHY 48V 100Ah Golf Cart LiFePO4 Battery with 200A BMS and Bluetooth on sale for $562 when you clip the $130 off coupon and apply code BYE130F or USFC130 at checkout (Backup code: USAFF120). >Now $484.03
A metal case houses the battery while Bluetooth and an LCD monitor provide battery-status information. Shipping is free from US warehouse.