Compaq Armada V300 Series Reference Manual page 49

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Charge the battery pack in the computer's battery bay or a
MultiBay while connected to an external power source or while
docked in the optional port replicator.
You can also charge up to two battery packs in the optional
battery charger. However the battery charger has only one slot for
the main battery and one slot for the MultiBay. Therefore, you can
only charge two battery packs at one time if one is the main
battery and the other battery is for the MultiBay.
A new battery pack should be fully charged before it is
used for the first time. The battery pack will work without being
fully charged, but the battery gauge will not show an accurate
charge until the battery pack receives its first full charge.
Battery packs charge in the following sequence:
1. The primary battery in the computer battery bay
2. A second battery pack in the computer MultiBay
Battery packs are discharged in the reverse order, with the battery
pack in the MultiBay depleted first. See Chapter 2 for bay
locations.
To charge battery packs, follow these steps:
1. With battery packs in the battery bay and/or MultiBay,
connect the power cord to the computer and plug it into an
electrical outlet.
2. Turn on the computer if you want to use it while the battery
packs are charging.