Please ensure the product(s) that you are going to buy fits the brand, model and part number of your device.

Specifications:

Battery Type: Li-ion
Color:  Dark Grey
Dimension:  
Capacity:  4400mAh
Volt:  14.80V
Replace battery part number: 
Gateway & eMachines
101069, 101339, 101340, 101341, 101343,
102738, 102739, 102800, 102801, 102889,
1533218, 6500917, AAFQ50100005K4,
AAFQ50100005K5, AAFQ50100005K6,
AAFQ50100005K7, ACEAAFQ50100005K1,
ACEAAFQ50100005K4, ACEAAFQ50100005K5,
ACEAAFQ50100005K6, ACEAAFQ50100005K7,
DAK100440, DAK100440-X, DAK100440-Y,
Li4402AE, NBACEM101069 ,AAFQ50600003K0,
DAK100440-000900, AAFQ50100005K2,
GT-M520, AAFQ50100005K6, ACEAAFQ50100005K1,
ACEAAFQ50100005K4, ACEAAFQ50100005K7,
DAK100440-000103, DAK100440-000200,
6500917, 6911B00084B, AAFQ50100005K5,
ACEAAFQ50100005K6, EM-M2000, EM-M6000,
40006971, ACEAAFQ50100005K5,
DAK100440-000302, 101340, LI4402A
This battery is also compatible with the following models : 
GATEWAY
Gateway M520, Gateway M520S, Gateway M520X,
Gateway M520XL
Gateway 7110GX,Gateway 7210GX,Gateway 7215GX ,
Gateway 7305GZ ,Gateway 7320GZ ,Gateway 7322GZ ,
Gateway 7324GZ ,Gateway 7325GZ ,Gateway 7326GZ ,
Gateway 7330GH ,Gateway 7330GZ,Gateway 7405GH ,
Gateway 7405GX ,Gateway 7410GX ,Gateway 7415GX ,
Gateway 7422GX ,Gateway 7426GX ,
Gateway 7508GX ,Gateway 7510GX ,Gateway MX7118 ,
Gateway MX7337h ,Gateway MX7337 ,Gateway MX7340 ,
Gateway MX7515 ,Gateway MX7515h ,Gateway MX7525

Emachines M2000 series
Emachines M2100 series
E-Machines M2105, M2350, M2352, M2356,
Emachines M6000 series
E-Machines M6811, E-Machines M6805, E-Machines M6807,
E-Machines M6410, E-Machines M6412
E-Machines M6414,E-Machines M6805, E-Machines M6807,
E-Machines M6809, E-Machines M6810, E-Machines M6811

Understanding your batteria Gateway 7210GX 7215GX LI4402A M520 M520S akku  Needs

What is the run time of  batteria Gateway 7210GX 7215GX LI4402A M520 M520S akku ?

laptop batteries have two main ratings on them: Volts and Amperes. Because size and weight of laptop batteries is limited when compared to larger batteries such as car batteries, most companies show their ratings with Volts and Milliamperes. One thousand Milliamperes equals 1 Ampere. When buying a battery, select batteries with the most Milliamperes (or mAh). Batteries are also rated by Watt-Hours, perhaps the simplest rating of all. This is found by multiplying the Volts and the Amperes together. For example:

14.4 Volts, 4000mAh (Note: 4000mAh is equal to 4.0 Amperes).

14.4 x 4.0 = 57.60 Watt-Hours

Watt-Hours signifies the energy needed to power one watt for one hour. This laptop battery can power 57.60 watts for one hour. If your laptop runs at 20.50 watts, as an example, this laptop battery could power your laptop for 2.8 hours.

How can I maximize the performance of my batteria Gateway 7210GX 7215GX LI4402A M520 M520S akku?

There are several steps you can take to help you get maximum performance from your laptop battery:

Prevent the Memory Effect - Keep the laptop battery healthy by fully charging and then fully discharging it at least once every two to three weeks. Exceptions to the rule are Li-Ion batteries which do not suffer from the memory effect.

Keep the laptop Batteries Clean - It’s a good idea to clean dirty battery contacts with a cotton swab and alcohol. This helps maintain a good connection between the battery and the portable device.

Exercise the Battery - Do not leave the battery dormant for long periods of time. We recommend using the battery at least once every two to three weeks. If a laptop battery has not been used for a long period of time, perform the new battery break in procedure described above.

Battery Storage - If you don’t plan on using the laptop battery for a month or more, store it in a clean, dry, cool place away from heat and metal objects. NiCad, NiMH and Li-Ion batteries will self-discharge during storage; remember to recharge the batteries before use.

Upgrade my batteria Gateway 7210GX 7215GX LI4402A M520 M520S akku from NiMH to Li-Ion

NiCad, NiMH and Li-Ion laptop batteries are all fundamentally different from one another and cannot be substituted unless the laptop has been pre-configured from the manufacturer to accept more than one type of battery chemistry. Please refer to your manual to find out which rechargeable battery types the laptop device supports or use our Battery Finder above to find all the compatible laptop batteries for your device. It will automatically list all of the battery chemistries supported by your specific device. If your device does allow you to upgrade the battery from NiMH to Li-Ion, you will typically get longer run times.

For example, if your laptop uses a NI-MH battery that is 9.6 Volts, 4000mAh and the new li-ion laptop battery is 14.4 Volt, 3600mAh, then you will obtain longer run time with the li-ion battery.

Example.

Li-Ion: 14.4 Volts x 3.6 Amperes = 51.84 Watt Hours
Ni-MH: 9.6 Volts x 4 Amperes = 38.4 Watt Hours
The Li-Ion is stronger and has longer run time.