AASTRA DT4x2 for BusinessPhone User Guide EN - Manual (Page 110)

Installation
BusinessPhone – Cordless DT412/DT422/DT432 110
Installation
This chapter describes how to connect and charge the battery of
your Cordless. You will also find procedures for installation and
maintenance of your Cordless.
Note: If you have a DT412 or a DT422 phone, you need to
know what version of the phone you are using, as only
certain battery packs are compatible with each version.
Check the phone label to see the phone version. If the label
starts with “RAID2-” your phone is a version two phone.
ATEX battery and charging information (DT432)
• It is only allowed to use the special ATEX battery pack together
with the DT432 ATEX phone. Using a standard battery pack will
void the ATEX approval.
• The DT432 ATEX phone may only be charged in the ATEX desk
top charger II and in rack charger II.