To determine the battery life, divide the capacity by the actual load current to get the hours of life. The cell voltage of alkaline cells steadily drops with usage from 1.54 volts to about 1 volt when discharged. Alkaline cells exhibit a slightly increased capacity when warmed and the capacity drops significantly at temperatures below freezing. Mercury and silver oxide batteries have nearly twice the capacity as alkaline batteries of the same size but the current ratings are significantly lower. Alkaline batteries also have good shelf life making them ideal for home-made electronic projects.
Rechargeable batteries have less capacity than primary cells as shown in the following chart.
This chart shows the capacity as a percentage of the capacity of an alkaline battery with the same dimensions. The recharging takes longer than 10 hours as this charging rate might inply due to charging inefficiency. Full charging usually taking at least 14 hours.