The second one should roughly last twice as long as the first one. You can't really say how long as it depends what you are using the computer for, but whatever you are doing the second one will always last about twice as long.
mAh = milliamp hours, which is battery capacity
That would depend on the actual battery's specifications. I've seen some D cells rated as low as ~2000 mAh. However a full true D cell should have a rating between 10,000 mAh and 15,000 mAh.
These figures represent capacities of use for batteries. If a device uses 50 mA an hour on a 800 mAH battery, the device would operate for 16 hours before depleting the battery. If the same device was connected to a 700 mAH battery, the device would operate for 14 hours before depleting the battery.
probably, yes. imagine putting twice a much AA's in your radio or whatever.
About 11 minutes
It depends on the voltage. WH = Watt Henry, mAH = milliamp Henry, watts = amps * volts and milliamps= 1000 * amps. Thus the conversion is: mAH = 1000 * WH / V, where V is the voltage. I'm looking at the battery for my Dell Studio and it's rated 85WH and 11.1V. So it's 1000 * 85 / 11.1 = 7658 mAH, so in this case 85WH is better than 6600 maH. If we solve 1000 * 85 / V = 6600, we get V = 12.9. When converting from WH, the bigger the voltage the lower the mAH. So for voltages bigger than 12.9 V, 6600mAH is better than 85WH. Hope this helps.
up to 5 hours max depending on laptop battery consumption rate
mah zeh (מה זה) = "what is this" or "what is that"
6600 as a fraction= 6600/1
The number that you refer to is the ampacity of the battery. The higher the number the longer the battery will operate in the device. As long as the voltage output of the two batteries are the same it will not ruin your laptop.
The second one should roughly last twice as long as the first one. You can't really say how long as it depends what you are using the computer for, but whatever you are doing the second one will always last about twice as long.
The multiples of 6600. Just calculate 6600 x 0, 6600 x 1, 6600 x 2, etc.
33% of 6600 = 6600*33/100 = 2178
75% of 6600= 75% * 6600= 0.75 * 6600= 4,950
6600
nothing!!