The voltage will increase but the amperage will stay the same. For instance: Connect 2 12 volt 100 amp batteries in series and you will have 24 volts at 100 amps.
The amperage is governed by the load that is connected to the battery circuit. Divide that amperage into the 1.6 amp hours and that will give you the endurance of the battery in hours.
Sony estimates that the battery charge time is two to six hours for the standard capacity battery, and three to nine hours for the large capacity battery.
The capacities of batteries are rated in amp hours. The higher the amp hour rating of a battery the longer the device connected to the battery will operate. Depending on what the connected load draw in amps is, will determine how long the connected device will operate.
The amp hours capacity of a battery remains the same whether it is connected to a 12-volt DC load or a 120-volt AC inverter. So, the battery would still have 100 amp hours regardless of the inverter voltage.
You need 3000 x 24 watt-hours or 72,000 watt-hours. A typical car battery has a capacity of 50 Ah or 600 watt-hours, so you would need 120 car batteries, connected in the right combination of series and parallel to give the right voltage for the inverter.
The rating of "4600 mAh" is one description of the battery's capacity. It doesn't tell you anything about the delivery or discharge rate of the battery. Those depend on the external circuit that you have connected to the battery. For example, if nothing is connected to the battery's terminaks, then the battery is giving zero amperes.
A 12 Volt, 50 AH battery delivers 6,000 Watt-Hours of electricity. Two 12 volt, 50 AH batteries, wired in series provide 24 Volts at 50 AH, which now delivers 12,000 Watt-Hours of electricity. Wiring the two batteries in series changes the voltage, but not the amperage. Wiring the two batteries in parallel changes the Amperage, but not the voltage.
When placing voltage sources in parallel, the total voltage is the same as the individual battery's voltages. For example: If I was to place 4 "AA" 1.5 volt batteries in parallel with a life of x hours, the out put would be 1.5 volts with a life of 4x hours. note: never place batteries in parallel that are not in the same condition (charge, voltage, ect...).
would discharge in 18 hours
The AH means Amp Hours and is a measure of how much electricity the battery can store. Thus if the 12AH and 15AH batteries were connected to THE SAME device (one after the other) the 15AH battery would run the device for longer than the 12AH battery.
The battery life on the Compaq Presario c700 series laptop doesn't seem to be that good it tends to run for around 2 hours with no recharge, overtime this will worsen as the battery ages.
It depends on what you want to do with the batteries. They can be connected in series to give you a total of 12 VDC. In a series connection a jumper is required between battery one's negative post to battery number two's positive post. If you want to increase the amp hours delivered at 6VDC they can be connected in parallel. In a parallel connection two jumpers are required. Battery one's negative post to battery two's negative post. Likewise the same procedure with the positive posts.