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:  black
Dimension:  123.60*108.76*20.66 mm
Capacity:  4400.00mAh
Volt:  14.80 V
Replace battery part number: 
23UD40003A 23-UD4000-3A
23-UD4200-00 63-UD4024-30
7014870000 7018480000
755-3S4000-S1P1 755-3S4400-S1P1
755-3S4400-S1S1 755-3S4400-S2M1
755-4S4000-C1S1 755-4S4000-S1P1
755-4S4000-S1S1 755-4S4000-S2M1
755-4S4000-S2S1 755-4S4000-SIPI
755-4s4000-spp1 755-4S4400-C1S1
755-4S4400-S1P1 755-4S4400-S2M1
755-4S4400-SIPI 7553S4000S1P1
7553S4400S1P1 7553S4400S1S1
7553S4400S2M1 7554S4000S1P1
7554S4000S2M1 7554S4400S2M1
755XX5 909-2220
A5527524 BP755
UN755  
 
This battery is also compatible with the following models : 
UNIWILL
Uniwill N755, Uniwill N755CA3 ,Uniwill N755CA5 ,
Uniwill N755CI0 Uniwill N755IA, Uniwill N755IA0 ,
Uniwill N755IA6 , Uniwill N755IAX
Uniwill N755II , Uniwill N755II0 , Uniwill N755IIX ,
Uniwill N755IN Uniwill N755IN0 ,Uniwill N755II1 ,
Uniwill N755II5, Uniwill 755IA
Uniwill N755II8 ,Uniwill N755INX ,Uniwill 755CI0 ,
Uniwill 755II1 Uniwill 755II8 , Uniwill 755IN ,
Uniwill 755SI , Uniwill 755SI4

FUJITSU
Fujitsu Siemens Amilo 755x
Fujitsu Siemens Amilo A7620
Fujitsu Siemens Amilo A8620
Fujitsu Siemens Amilo A7600
Fujitsu Siemens Amilo D6830
Fujitsu Siemens Amilo D7830
Fujitsu Siemens Amilo D7850
Fujitsu Siemens Amilo D8830
Fujitsu Siemens Amilo D8850
Fujitsu Siemens Amilo L6820
Fujitsu Siemens Amilo L6825

Packard Bell
Packard Bell EasyNote H Series
Packard Bell EasyNote HSeries
Packard Bell EasyNote H5 Series
Packard Bell EasyNote H5
Packard Bell EasyNote H5264
Packard Bell EasyNote H5264w
Packard Bell EasyNote H5285
Packard Bell EasyNote H5308
Packard Bell EasyNote H5310
Packard Bell EasyNote H5315
Packard Bell EasyNote H5360
Packard Bell EasyNote H5530
Packard Bell EasyNote H5535
Packard Bell EasyNote H5605 EI

SYSTEMS
EISYSTEM 4405 Series,EISYSTEM 4406 Series EISYSTEM 4411 Series,
EISYSTEM 4412 Series EISYSTEM 4413 Series,EISYSTEM 4418 Series
EISYSTEM 4419 Series,EISYSTEM 4420 Series

Gericom:
Gericom FX5200 FX5600 Series,
Gericom 755CAO 755IA6 755IAX 755II0 755IN(X) Series,
Gericom Hummer 2020eXL 2040eXL 2440C 2430 2640e 26640 30680XL Series,
Hummer Advance 2560XL 2660XL 2669XL 2860XL Series,
Hummer Extreme Hummer Force Hummer Radeon 9000 Mobility

MAXDATA
MAXDATA ECO 755 Eco 3200X Eco 3150X , M-book 755 ,
M-book 1200 T/X Vision 755 ,Vision 4200X

TARGA:
TARGA Visionary XP-210 Traveller 210 PEACOCK
Freeliner XP 210 Series

Hyperdata
7550
N755II0

Iridium
Starbook 755
Starbook S755

Jewel
Saffier: 1450, 1460, 1510

Max Computer
MaxBook 755IA
MaxBook 755IA0
MaxBook N755II1

Max Station
MaxBook 755IA
MaxBook 755IA0
MaxBook N755II1

Mecer
Mecer N755
Mecer N755-SI
Mecer N755IA
Mecer N755II
PowerX N755IA
PowerX N755II

Northgate
U755iA
U755II

Pc Club
EnPower ENP 275
EnPower ENP 875 Mythos Spartan
EnPower ENP 87503 Mythos Spartan Plus Premier
N755CI
N755II1
N755S1

Prestige
Prestige 87503

Roverbook
Voyager D512 (755II1)

Super Talent
N755
N755IA
N755II
N755INX

Systemax
N755
N755II
N755II0
N755II1
Pursuit 2110
Pursuit 2120
Pursuit N755
Pursuit N755II

Targa
Visionary: XP 210, XP II, XP-210

UBM Computer
N755II

United Micro
N755SI4

User Easy
755II8
755IN

Vega
VegaPlus N755 X

Technology
N755IN Xterasys
XteraNote 755IA6
XteraNote 755II8

Yakumo
Q7M 2.2 DVD-RW
XD Yamsan
N755IIX

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.

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 755-4S4400-S2M1 A5527524 un755 755-3S4000-S2M1 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.