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One lasts longer than the otherShort answer: a 2850 mAh will last quite a bit longer than an 1850 mAh. Long answer: mAh stads for "Milliamp hours" Many flashlight bulbs use a…round 500 mAh, which means that in one hour, they will use up 500 milliamps of electricity. A standard double A battery ("AA") is 1.5 volts. Many flashlight bulbs require 2 batteries to operate... So lets make an example bulb. It's a 3 V 500 mAh bulb. With two 2850 mAh AA batteries, that bulb will shine roughly 11.4 hours before needing a charge (2850 mAh times 2 batteries is 5700 mAh total. Divide that by the bulbs' 500 mAh and you get 11.4 hours) With a couple of 1850 mAh, the same bulb would only shine for 7.4 hours. As a battery gets close to dying the bulb will dim. Picture the battery like your lungs. Take a full breath, the battery is charged. Breath out at a constant rate, and when you get close to the end of your lung capacity you will start to push less and less air until you are just *barely* blowing any air out. That's kindof what happens with a low battery (EE's will probably blast me on that one, but that's the best way to describe it to someone who doesn't feel like reading a term paper on electrons) Hope that helps! -------------------------------- Actually, if you put two 1.5V 2850mAh batteries in SERIES, you will get a 3V and 2850mAh battery. The voltage doubles but the current capacity does not. If you were to put the two batteries in PARALLEL, the voltage would remain 1.5V but the current capacity would double to 5700mAh. The consequence is that the bulb will shine half the time that was calculated in the original answer. The rest of the demonstration is fine. -------------------------------- Some corrections the original answer: Firstly a typical rechargeable AA cell is rated at 1.2v not 1.5v. Non-rechargeable AA cells are typically 1.5v. Secondly mAh is a measure of the battery's capacity; bulbs do not have a capacity, so you do not rate a bulb in mAh you rate it in mA. So a conventional filament bulb as implied above might draw 500 mA from the cells when you apply 2.4 volts (in series). Some correction are in order assume 500mah means that battery can provide 500ma for 1 hour that is true. That the way should be read.. At 1 hour do not expect nothing more. And adding two battery in parallel is a very bad idea there can be circulating current between batteries adding in series the current remain 500mah but the power has increase two fold because now there is 2.4v available.
It usually means an upgrade to a 9 cell battery with (theoretically) double the usage time, but that obviously isn't an exact science, but it is a decent rough guide
A milliamp-hour (mAh) is a measure of quality of a battery. It tells you how many hours the batter can provide one milliamp of current before it will die. A volt is th…e unit of electric potential. AA, AAA, C, and D batteries are all 1.5 Volts. A 9 Volt is 9 Volts. Car batteries are 12 Volts. AA's are typically rated in thousands of mAh. Cs and Ds are more, AAA and 9 Volts are typically less. If you know the power that a device consumes [i.e. Remote, wireless game controller], you can calculate how long your batters will last in the following manner. Time = [mAh / 1000] * [# of batteries * battery voltage] / device power Ex: Device is rated at 1W using 4 AA [1.5 Volt] batteries rated at 1000mAh. Time = [ 1000mAh / 1000 ] * [4 * 1.5 Volts] / 1 W = 6 Hours
These are two common ways battery capacity is measured. Wh stands for "Watt hours", and it's a measure of the actual energy content of the battery; it measures how much power… (watts) the battery can supply multiplied by the number of hours it can do so before it runs out. Most batteries are labeled with a capacity in mAh (milliampere hours). This is a measure of the electric current the battery can supply multiplied by the number of hours it can do so. Example: if a battery is labeled 3000 mAh, it should be able to supply 3000 mA of current for one hour, 1500 mA of current for 2 hours, etc. You can figure out the Watt hours for a battery by multiplying the voltage of the battery by the amp hours (amp hours = millamp hours / 1000).
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.
200 mah s !!!
As an example, digital camera batteries with higher mAh values theoretically last longer without requiring a recharge, allowing one to take more photographs before having to r…eplace the batteries.
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 batter…y. If the same device was connected to a 700 mAH battery, the device would operate for 14 hours before depleting the battery.
4400 mAh means that the battery can produce 4400 mA for one hour. Similarly, 7200 mAh means 7200 mA for one hour. In reality, these specifications are for a eight-hour ra…ting, meaning that the 4400 mAh battery can produce 550 mA for eight hours but, comparatively, you can just ratio the ratings, so the 7200 mAh battery will last 60% longer than the 4400 mAh battery There's more to it than that, however, as you need to know that the laptop is designed to use either battery, otherwise the camparison is meaningless.
mAh is a measure of how much energy a battery can store - so a 2800mAh battery will last nearly twice as long as a 1500mAh battery, take longer to charge and probably be more …expensive.
The main difference between a 4000 mAH and a 4400 mAH lithium ion battery is that lithium ion batteries are designed to last longer. These batteries are commonly used with…in laptops. A 4400 mAh battery has 10% more capacity than one rated at 4000 mAh. That means it would last 10% longer, given the same load connected to it.
The 4000 mAh battery can produce an average of 500 mA for 8 hours, while the 5000 mAh battery can produce an average of 625 mA for 8 hours. It is standard nomenclature to spe…cify battery capacity in mAh or Ah, but normalize it to an 8 hour rate. You can pull more than the 8 hour rate, but the time capacity will not be linear, i.e. pulling 4000 mA from a 4000 mAh battery will exhaust the battery before 1 hour. Conversely, pulling 250 mA from a 4000 mAh battery will exhaust the battery in more than 16 hours.
The 900mAh battery will work fine - it just gives your phone an extended time between charges. I've replaced the original 700mAh battery in my phone for a 950mAh one - and get… about 40% extra talk & standby times.
Not really. 6000 mah means the battery has a capacity of 750 (6000 / 8) ma for 8 hours, while 7800 mah means the battery has a capacity of 975 (7800 / 8) ma for 8 hours.
The latter has 50mAh more than the other.