Avaya 4075 - Manual (Page 230)

Handset accessories
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3. Insert the battery pack into the charger slot as shown in Figure 24 .
When the battery pack is fully charged, the indicator lamp goes out.
4. Remove the battery pack from the charger, and replace the protective
plastic cover over the battery charger slot.
5. Install the battery pack in the handset. See “Removing and installing
the battery pack (4075 only)” (page 227) for more information.
Figure 24: Charging the battery pack
Attention: Insert the battery pack in the same orientation as it is
shown in the figure, otherwise the battery pack
cannot charge. When the battery pack is correctly
inserted, the indicator lamp lights.