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Don't understand how that calculator gives 43 hours when discharging it to 0% takes 37 hours.That's because your battery is rated at 500mAh and not 500Ah. For the purposes of that calculator your battery capacity is 0.5 Ah. Discharge rate is 0.0135 Ah. This gives you a safe 80% discharge time of 43.784 hours.
is it 500mAH/13.5mA=37.04H?