no
Sure, if they have the same voltage.
7900 - 7200 = 700
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.
seems like there is not physical size difference, only capacity is different. 5C ist better than 5CA, provides more battery life. They can be interchanged without problems.
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.
A 2200 mAh (milliampere-hour) battery carries about 30% more charge than a 1700 mAh battery, but there may be other factors to consider in deciding which one is better for a particular use. A fully charged battery that is rated for 2200 mAh should be able to deliver, for example, 100 mA (milliamps) of current for 22 hours.
It's not a question about "better", it's about what's most important to you - weight/size or runtime. The 4800 mAh battery will last longer, but will probably also be bigger/heavier. More to carry around. The 3600 mAh will last a bit shorter, but will be smaller and lighter. You have to decide what you prefer.
If they're the same voltage and chemistry - yes
mAh, milliampere-hour, is used as an informal measure of energy stored in a battery - the product of the current (in mA), and how long this current can be sustained (in hours). More mAh (or Ah) is therefore better.
It's not a question about "better", it's about what's most important to you - weight/size or runtime. The 4400 mAh battery will let you run the laptop on battery longer, but will probably also make it a little bit bigger/heavier. More to carry around. The 2550 mAh will last a bit shorter, but will keep the laptop smaller and lighter. You have to decide what's important to you.
mAh is short for milli ampere hours. It's a measure of the capacity of the battery. Comparable to the size of the fuel tank of a car. So a 6500 mAh battery is almost ten times the size of a 700 mAh battery.