19 Maintenance Battery Maintenance
236
Charging Batteries
The M3538A Lithium Ion Battery should be charged in either the HeartStart MRx or in a Philips-
approved battery support system. The two methods of charging in the HeartStart MRx are as follows:
Using AC power - Insert the battery to be charged into Battery Compartment A. Insert the AC
Power Module into Battery Compartment B and connect to an AC power source.
Using DC power - Insert a battery to be charged into Battery Compartment A. If a second battery is
in need of charging, insert it in Battery Compartment B. Connect the DC Power Module to the
HeartStart MRx and the DC power source.
Once AC or DC power is applied, the External Power Indicator turns green and batteries in the
HeartStart MRx charge. Batteries are charged one at a time. With the HeartStart MRx turned off and
at a temperature of 25
o
C (77
o
F), a fully discharged battery typically charges to 80% of its capacity in 2
hours, and to 100% of its capacity in 3 hours. Batteries charge at a slower rate with the device turned
on.
Batteries should be charged at temperatures between 0
o
C (32
o
F) and 45
o
C(113
o
F).
Charge Status
You can check the battery’s state of charge by:
• periodically pushing the fuel gauge button on the battery to illuminate the fuel gauge. Each LED
represents a charge of approximately 20% of capacity.
• turning the Therapy Knob to any mode of operation and observing the battery power indicators
displayed in the General Status area (see “General Status” on page 16).
Battery Calibration
Battery capacity diminishes with use and age. Battery calibration checks to see if the battery is nearing
the end of its useful life and should be discarded. Battery calibration also ensures that the fuel gauge
provides accurate estimates of the battery’s state of charge, based on the total available capacity.
Calibrate a battery when the Cal Recommended message appears during an Operational Check, or every
6 months, whichever comes first. Battery calibration may be performed in the HeartStart MRx or in a
Philips-approved battery support system. To calibrate a battery in the HeartStart MRx:
1 Connect the HeartStart MRx to AC or DC power.
2 Insert the battery to be calibrated into Battery Compartment A or B.
3 Turn the Therapy Knob to Monitor.
4 Press the Menu Select button.
5 Using the Navigation buttons, select Other and press the Menu Select button.
6 Select Battery Calibration and press the Menu Select button.
7 Press the Menu Select button to acknowledge the message, Leaving Normal Operational Mode.
The Calibration view is displayed. If external power is not detected, you are prompted to Apply
External Power. If there is no battery in either battery compartment, you are prompted to Insert
Battery. If there are batteries in both battery compartments, you must select which battery to
calibrate.
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