Battery Packs; Charging Battery Packs - Compaq Evo N600c Series Hardware Manual

Charging Battery Packs

Any battery pack in the system charges whenever the computer is
connected to external power.
The computer supports up to 2 battery packs.
I
A primary battery pack 1 is an 8-cell lithium ion battery
pack that can be used only in the battery bay.
I
A MultiBay battery pack 2 is an optional 6-cell lithium ion
battery pack that can be used only in the MultiBay.
Identifying a primary and a MultiBay battery pack
Multiple battery packs in the system charge and discharge in a
preset sequence determined by location.
Hardware Guide

Battery Packs

4
4–1