laptop battery on 8.0

[Zoran Kolic]

Howdy!
Old laptop hp nx9020 with i386 8.0.
Original battery was 371785-001, 11.1 V and 4400 mAH.
New one says it is f4809 at 14.8 V. I also lost precise
measurement of remain battery time:

hw.acpi.battery.life: 97
hw.acpi.battery.time: 267

then again:

hw.acpi.battery.life: 97
hw.acpi.battery.time: 388

I'd like to hear any opinion on this subject. Could I
damage laptop? Also, what I could do to regain "life"
option?
Best regards

                                Zoran