GE ApexPro TT Technical Manual page 28

Equipment Overview
Battery functional life
2-8
4. Close the battery cover.
NOTE
When the Change Battery LED starts flashing, the transmitter has
approximately 1 hour of reserve power before the unit shuts down.
CAUTION
GE recommends that you always replace both batteries at the same
time. Re-using old batteries or using a combination of old and new
batteries in the transmitter will compromise functionality of the
transmitter and increase the risk of fire hazard.
Do not store the batteries in the transmitter when not in use. Storing
the batteries in the transmitter can cause corrosion of the batteries
and of the transmitter.
Be sure to insert batteries into the transmitter in the correct
direction as indicated on the back of the case. Do not insert batteries
in the reverse direction.
The transmitters runs on 2 AA batteries. For the ApexPro transmitter, the battery life
is approximately 40 hours. For the ApexPro CH transmitter, the battery life is
approximately 120 hours. For the T14 transmitter, the battery life is approximately 65
hours.
For optimum performance, follow these guidelines:
Install 2 new alkaline batteries each time you begin monitoring a new patient or
whenever the Change Battery LED on the transmitter is flashing.
Do not use rechargeable batteries.
Always change both batteries at the same time.
Always use new batteries.
ApexPro™
220A
2001989-351A