I have a HP Pavilion dv4 2145dx laptop. Can I replace its original battery for a 12 cells battery?

The current battery is not working propertly. It is supposed to be a 6 cells battery, but I have heard that a 12 cells battery last much longer. Would you recommend doing that change? what battery should I buy that for sure will fit my laptop? Thanks

Seems to me that your hard drive is gonna fail soon, trying running hard drive diagnostics from the BIOS.
HP Elite h8-1070T Intel Core i7 2600 12GB RAM AMD Radeon HD 6850 1GB Windows 8 Professional 64-bit (Gaming)
HP DC7900CMT Intel Core 2 Duo 3Ghz 4GB RAM Windows 8 Professional 64-bit (Workstation)
HP XW4200 Intel Pentium 4 HT 3.6GHz 4GB RAM Windows XP Professional (Home File Server)

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