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:  175.00x85.00x22.40 mm
Capacity:  6000.00mAh
Volt:  11.10 V
Replace battery part number: 
23-UB7203-00 63-UB4022-00
A5525124 UN251
UN251S1 UN251S1(C1)
UN251S1(C1)-P UN251S1-S1
 
This battery is also compatible with the following models : 
Advent:
Advent 7016
Advent 7017
Advent 7026
Advent 7027

ERGO:
Rocketbrick
RocketBrick4A
RocketBrick4A(N251C2)

GERICOM:

GERICOM Mobile Athlon 
GERICOM BlockBuster XP 
GERICOM BlockBuster Radeon M 
GERICOM BlockBuster Advance 
GERICOM BlockBuster 
GERICOM 251S5 GERICOM 251S6 
GERICOM 251S1 
GERICOM 251C5 
GERICOM 251C1 

Haking Vision Series:
TARGA Visionary
TARGA Visionary XP
TARGA Visionary XP 2200 Plus
TARGA Radeon 9000
TARGA Radeon 9600

PEACOCK:
Freeliner
FreeLiner XP
FreeLiner XP 2000
FreeLiner XP 2500 Plus

SEANIX:
Seanote
SeaNote N251
SeaNote S-E251-01

SOLUS:
Solus 1030 series

UNIWILL:
Uniwill N251C1
Uniwill N257SA1
Uniwill N251C2
Uniwill N251C5
Uniwill N251S1
Uniwill N251S5
Uniwill N251S6
Uniwill N251S7
Uniwill N251S8

VEGA:
Vega VegaPlus 901
Vega VegaPlus 901XL
Vega VegaPlus N251C1
Vega VegaPlus N251S6
Vega VegaPlus N251S8

VOBIS:
VOBIS Power 15M9 DVD-R/-RW XD
VOBIS Power 15M9 XD

Hyperdata:
Hyperdata 2550

WEBTECH N251C1 
WEBTECH N251S6
WEBTECH N251S8 
PC CLUB EnPower ENP252 
PC CLUB EnPower ENP251 
PC CLUB EnPower ENP 252 
PC CLUB EnPower ENP 251 
JEWEL N251C2 
JEWEL Brilliant 2770
JEWEL Brilliant 2775
JEWEL Brilliant2780 
MYBOOK N251C1 
MYBOOK N251S6 
MYBOOK N251S8 

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 ADVENT N251C1 N251C2 N251S1 N251S6 N251S8 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.