Typically the AH rating is based on a 20 hour discharge rate. Therefore, a 100 AH rated battery can deliver 5 amps for 20 hrs (5 amps x 20 hours = 100 AH) before the battery voltage drops below 10.5 volts. At discharge rates less than the 20 hour rate (0.83 amps in your case) the battery AH rating will increase slightly.
However: Discharging your battery to the AH rated level (10.5 volts) will result in greatly reduced life. The chart I have for Interstate deep cycle batteries indicates a life of 2200 cycles to 25% discharge (12.45 volts), 1000 cycles to a 50% discharge (12.25 volts) and 325 cycles to 100% discharge (11.9 volts).
In conclusion: Using your battery for 5 days between charging will result in greatly reduced life.
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Today's Featured Article - The River Tractor - by Charlie English Jr.. This is a 4010 John Deere that was used to farm on the Diamond Island which is in the Ohio River about 15 miles southwest of Evansville, Indiana. About ten years ago, this tractor was parked close to the bank as the river was washing the bank of the island away.
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