It is neither amperes per hour nor watts per hour. Those imply division (1 watt, over two hours, would be 1/2 a watt per hour. Useless as a unit for most of us). Ah and Wh are amps or watts multiplied by hours, pronounced as amp-hours or watt-hours (1 watt, for 2 hours, would be 2 watt-hours)
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It is neither amperes per hour nor watts per hour. Those imply division (1 watt, over two hours, would be 1/2 a watt per hour. Useless as a unit for most of us). Ah and Wh are amps or watts multiplied by hours, pronounced as amp-hours or watt-hours (1 watt, for 2 hours, would be 2 watt-hours)
The voltage of your battery decreases as it is used, like pretty much any other battery. Why are you guessing?