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A 12V, 10 Amp-Hour battery has a nominal 120 Watt-hours of energy
It should last about 120/5.3 = ~22-23 hours.
The reality is the AH rating is at a specific discharge rate, which is usually 20 hours. Which is pretty close to your discharge rate. If you had a larger load, say 20 Watts, the discharge rate is much higher and the energy lost to heating is more. You would probably only get 8-9 Amp-Hours.
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James
The pessimist complains about the wind; the optimist expects it to change; the engineer adjusts the sails.- William Arthur Ward (1921-1994)
Red-beard for President, 2020
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