what do you think of this battery

http://cgi.ebay.co.uk/Yuasa-Rechargeable-NP-2-1-Ah-12-V-Battery_W0QQitemZ330114274439QQihZ014QQcategoryZ14 951QQrdZ1QQssPageNameZWD1VQQcmdZViewItemhttp://cgi.ebay.co.uk/Yuasa-Recharge...QQitemZ3301142 74439QQihZ014QQcategoryZ14951QQrdZ1QQssPageNameZWD 1VQQcmdZViewItem