HP has just released laptop batteries that are guaranteed to last 3 years. Their Enviro Series has Boston-Power technology and is equivalent to a 6-cell battery. It is compatible with HP’s Pavilion dv4, dv5, dv6; HP HDX 16; HP G50, G60, G61, G70, G71; Compaq Presario CQ40, CQ45, CQ50, CQ60, CQ61, CQ70 and CQ71. At a price of $149.99, the company offers 24/7 phone and email support. The battery will also be available to customers when purchasing new PCs.