i believe u can read it from here, it is a 3 cell battery.
First off, I know this is a Singaporean forum and my expectations shouldn't be so high when it comes to the proper usage of English, but I do hope you can clarify which one you are exactly talking about.
Just in case you are talking about the NTU Acer Aspire One, may I know where you got this information from? Have you actually gone down to see it and asked if it comes with a 6 cell battery or 3 cell battery?
Operating System Linpus™ Linux® Lite / Window XP Home.
Processor Intel®Atom™ processor N270 (1.60GHz FSB, 512KB L2 cache)
Communication Acer InviLink™ 802.11b/g Wi-Fi CERTIFIED™ network connection, LAN: 10/100 Mbps Fast Ethernet.
Memory Single channel with onboard 512MB SDRAM and one one soDIMM slot, DDR2 SDRAM memory, 1GB RAM.
Display 8.9" WSVGA high-brightness ACer CrystalBrite™ TFT LCD 1024 x 600 pixel resolution
Storage NAND flash module or hard disk drive for internal storage 8GB / 120GB HDD (XP Home).
Audio High-definition audio support, Two built-in stereo speakers.
I/O Interface integrated Acer Crystal Eye webcam, supporting 0.3 megapixel resolution, Multi-in-1 card reader, 3 USB 2.0 ports.
Dimensions and weight 249(W) x 170(D) mm (9.8 x 6.7 x 1.14inches), 995g for SKUs with NAND flash module and 3-cell battery pack.
Color choices Sapphire blue, Seashell white.
Power 30W adapter with power cord, 24W 2200 mAh 3-cell Li-ion battery pack, 3-hour battery life for SKUS with NAND flash module and 3-cell battery pack.
Accessories Slip case, Wireless mouse, 4GB SD Card.
Warranty 1 year International Travelers Warranty(ITW).