Batterie pc portable, aidez moi svp

Bonjour à tous,

Voila, je viens d'acheter un pc portable mais il n'a pas de batterie et je ne trouve pas sur internet la batterie qu'il me faut.
Voila les infos que j'ai sur ce pc :

Portable acer emachines E520

caracteristique du constructeur :

Platform

* Intel® Celeron® mobile processor 575(1 MB L2 cache, 2 GHz, 667 MHz FSB, 31 W), supporting Intel® 64 architecture
* Mobile Intel® GL40 Express Chipset
* 802.11b/g Wi-Fi CERTIFIED® network connection

System memory

* Dual-channel DDR2 SDRAM support
* Up to 2 GB of DDR2 667 MHz memory, upgradeable to 4 GB using two soDIMM modules

Display

* 15.4" WXGA high-brightness (200-nit) TFT LCD, 1280 x 800 pixel resolution

Graphics

* Mobile Intel® GL40 Express Chipset with integrated 3D graphics, featuring Intel® Graphics Media Accelerator 4500M (Intel® GMA 4500M) with up to 1759 MB of Intel® Dynamic Video Memory Technology 5.0 (64 MB of dedicated video memory, up to 1695 MB of shared system memory), supporting Microsoft® DirectX® 10
* Dual independent display support
* 16.7 million colors
* MPEG-2/DVD acceleration

Audio

* High-definition audio support with two built-in stereo speakers
* MS-Sound compatible

Storage

* 160 GB hard disk drive

Optical media drive

* 8X DVD-Super Multi double-layer drive

Communication

* Video conference: Integrated webcam, 310K-megapixel resolution, featuring enhanced technology for low-light environments
* WLAN: 802.11b/g Wi-Fi CERTIFIED® network connection
* LAN: Fast Ethernet, Wake-on-LAN ready

Dimensions and weight

* 364.6 (W) x 273.6 (D) x 27.0/38.4 (H) mm (14.4 x 10.8 x 1.1/1.5 inches)
* 2.80 kg (6.17 lbs.) with 6-cell battery pack

Power

* ACPI 3.0 CPU power management standard: supports Standby and Hibernation power-saving modes
* 48.8 W 4400 mAh 6-cell Li-ion battery pack: 3.0-hour battery life
* 3-pin 65W AC adapter

Special keys and controls

* 88-/89-key keyboard with inverted "T" cursor layout, 2.5mm (minimum) key travel
* Touchpad pointing device
* 12 function keys, four cursor keys, two Windows® keys, hotkey controls, embedded numeric keypad, international language support
* Easy-launch button: WLAN

I/O ports

* Two USB 2.0 ports
* External display (VGA) port
* Headphone/speaker/line-out jack
* Microphone-in jack
* Ethernet (RJ-45) port
* DC-in jack for AC adapter


ACER Ordinateur Portable eMachines
-572G16Mi - Intel Celeron M 575 (2,0 GHz) - Ecran 15,4''
Processeur Intel Celeron M 575 (2,0 GHz) - Ecran 15,4'' TFT WXGA Haute Brillance - Résolution de 1280 x 800 pixels - 2048 Mo - Disque dur de 160 Go - Chipset graphique Intel GMA 4500M HD jusqu'à 1759 Mo TGM - Graveur de DVD Dual Double Couche - Réseau Ethernet - Réseau sans fil WiFi - 2 Enceintes stéreo - Webcam intégrée - Autonomie jusqu'à 3h00 - Poids de 2,8 Kg - Windows Vista Edition Familiale Basique

Merci mille fois à ceux qui pourront m'aider.

Manuel.