Don't worry - your battery is fine - at the risk of having to type out the entire manual

let me just say that the document goes onto say that if the battery is marginal or defective, the BF will stop all charging process and the green light will be on steady and the red light will flash.
Your situation, as you describe above, where you see both the green and red lights on steady - means that the BF couldn't take the battery to 80% charge in 72 hours - because it is hooked up to a large, good battery that is still not fully charged.
The amp hour rating of your lotus battery must be near the limit (theoretically 90Ah) of the charger and the lotus battery must be near complete discharge. Seems odd as I imagine you hook it up after you have driven the vehicle.

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