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

Specifications:

Battery Type: Lithium-ion
Color:  black
Dimension:  
Capacity:  4400mAh
Volt:  11.1V (compatible with 10.8V)
Replace battery part number: 
Gatway:
2524264
6501117
6501147
6501164
6501165
6501166
6501167
6501168
6501169
6501171
6501182
916C6810F
935C/T2090F
935C2150F
B1865010G00004
B1865010G00006
DAK100440-010144L
DAK100440-010802L
DAK100520-010102L
W35044LB
W35044LB-SP
W35044LB-SP1
W35044LB-SY
3UR18650F-2-ARM,
3UR18650-2-T0036,
3UR18650-2-T0037
This battery is also compatible with the following models : 
Gateway M-150 series
Gateway M-1400 series
Gateway M-1408j
Gateway M-1600 series
Gateway M-1615
Gateway M-1617
Gateway M-1618
Gateway M-1618N
Gateway M-1618R
Gateway M-1619j
Gateway M-6800 series
Gateway M-6801m
Gateway M-6802m
Gateway M-6803m
Gateway M-6804m
Gateway M-6808m
Gateway M-6815
Gateway M-6816
Gateway M-6817
Gateway M-6821b
Gateway M-6822
Gateway M-6823
Gateway M-6823a
Gateway M-6824
Gateway M-6825j
Gateway M-6826j
Gateway M-6827j
Gateway M-6828b
Gateway M-6829b
Gateway P-6300 series
Gateway P-6301
Gateway P-6302
Gateway P-6822
Gateway P-6825
Gateway T-1600 series
Gateway T-1616
Gateway T-1620
Gateway T-1621
Gateway T-1622
Gateway T-1625
Gateway T-6800 series
Gateway T-6801m
Gateway T-6802m
Gateway T-6815
Gateway T-6815h
Gateway T-6816
Gateway T-6816h
Gateway T-6817c
Gateway T-6818c
Gateway T-6819c
Gateway T-6820c
Gateway T-6821c
Gateway T-6822c
Gateway T-6823c
Gateway M-6305
Gateway M-6307
Gateway M-6308
Gateway T-6308c
Gateway T-6311
Gateway M-150 series
Gateway M-1400 series
Gateway M-1408j

Gateway M-1600 series
Gateway M-1615 Gateway M-1617 Gateway M-1618
Gateway M-1618N Gateway M-1618R Gateway M-1619j

Gateway M-6800 series
Gateway M-6801m Gateway M-6802m Gateway M-6803m
Gateway M-6804m Gateway M-6808m Gateway M-6815
Gateway M-6816 Gateway M-6817 Gateway M-6829b
Gateway M-6821b Gateway 6822 Gateway M-6823
Gateway M-6823a Gateway M-6824 Gateway M-6825j
Gateway M-6826j Gateway 6827j Gateway M-6828b

Gateway P-6300 series
Gateway P-6301 Gateway P-6302 Gateway P-6822
Gateway M-6825

Gateway T-1600 series
Gateway T-1616 Gateway T-1620 Gateway T-1621
Gateway T-1622 Gateway T-1625

Gateway T-6800 series
Gateway T-6801m Gateway M-6802m Gateway T-6815
Gateway T-6816
Gateway T-6816h
Gateway T-6815h
Gateway T-6817c
Gateway T-6818c Gateway T-6819c
Gateway T-6820c
Gateway T-6821c
Gateway T-6822c
Gateway T-6823c Gateway M-6305 Gateway M-6307
Gateway T-6308c Gateway 6308 Gateway T-6311

Gateway M-150 series
Gateway M-1400 series
Gateway M-1600 series
Gateway M-6800 series
Gateway P-6300 series
Gateway T-1400 series
Gateway T-1600 series

Understanding your Gateway T-6820c T-6821c T-6822c T-6823c T-6824c T-6825c battery  Needs

What is the run time of  Gateway T-6820c T-6821c T-6822c T-6823c T-6824c T-6825c battery ?

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 Gateway T-6820c T-6821c T-6822c T-6823c T-6824c T-6825c battery?

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 Gateway T-6820c T-6821c T-6822c T-6823c T-6824c T-6825c battery 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.