5
ii. Next pull out with pliers, the locking pin and retain for 
reinserting later.
iii. Twist alarm as indicated on housing to remove from mounting base plate.
iv. Finally, carefully pull off cable harness, by squeezing on side, to reveal
battery compartment. 
(Do not touch the pins on back of alarm.)
v. Flip up lid and note position of red plastic bar, under battery. When you
remove battery, the red door stop bar prevents the door closing unless a
battery is reinstalled. (On 123/9EI models there are 2 batteries/flags.)
from being mounted back on its mounting base plate.
We recommend the use of alkaline or lithium batteries for a longer 
Battery type/code nos.
Alkaline type: Eveready 522; Duracell MN1604; Duracell Ultra MX1604; 
Lithium type: Ultralife U9VL
vi. When you have fitted a fresh battery, check test button; if horn sounds then
reverse the process above, reconnect to the mains and switch circuit back on
at Consumer Unit.
If in any doubt, consult a qualified electrician as mains electricity can be
hazardous.
Red Battery Flag
5
ii.  Next pull out with pliers, if fitted, the locking pin and retain for
  reinserting later.
Push screwdriver where shown to release from base and twist
On Tamper Resist models, depress screwdriver where shown
iii. Twist alarm as indicated on housing to remove from mounting base plate.
iv. Finally, carefully pull off cable harness, by squeezing on side, to reveal
battery compartment. (Do not touch the pins on back of alarm.)
v. Flip up lid and note position of red plastic bar, under battery. When you
remove battery, the red door stop bar prevents the door closing unless a
battery is reinstalled. 
This 
prevents the alarm from being mounted back on its mounting base plate.
safety feature also prevents the cable harness from being reconnected, and
We recommend the use of alkaline or lithium batteries for a longer 
service life.
Battery type/code 
CAUTION FOR LITHIUM ONLY
nos.
Alkaline type:  Energizer 6LR61; Duracell MN1604; Duracell Ultra MX1604; 
Gold Peak 1604A; 
Lithium type: Ultralife U9VL
*On rechargeable/Long Life models there are no user serviceable 
batteries to be changed. (See Section 6.)
Danger of explosion if battery is incorrectly replaced.
Replace only with the same or equivalent type.
vi. When you have fitted a fresh battery, check test button; if horn sounds then
reverse the process above, reconnect to the mains and switch circuit back on
at Consumer Unit.
If in any doubt, consult a qualified electrician as mains electricity can be
hazardous.
Red 
Battery 
Flag
PP3
Never remove or connect cable harness, without having disconnected  
mains power, or arcing could occur, damaging the alarm.