ABB AC 900F Mounting And Installation Instructions Manual page 96

Insertion of the TA 951F battery
To connect the battery to the power supply, plug in the battery connector into the
mating socket. The connector is keyed to ensure reverse polarity protection. Close
the housing with the previously removed front panel or display unit.
Battery_04_us.png
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Module with battery holder
Place the battery in inclined position onto the lower holder. Press the
battery downwards and then to the left until it locks in the upper holder.
Both holders are provided for locking purposes only; they are not
electrically connected to the battery.
Section 7 Commissioning
M&I – AC 900F Controller