Philips V24CT User's Reference Manual page 37

Battery life includes the time during the low battery alarm (INOP
"Recharge Batteries") until the unit shuts off.
We recommend you use 2 fully charged batteries to get the optimum
battery life when using the battery power supply.
Battery
•
Specifications
•
•
Note—
16 hours to 90% of full capacity if the monitor is on.
Note—
LEDs may take some time to cycle to the appropriate charge indication
and may underreport battery capacity during this setting period. Use the
fuel gauge rather than the Battery Charge LEDs during this period to
estimate battery capacity or turn the monitor off to accelerate the charge
setting time.
See Chapter 12, "Battery Information (V24CT and V26CT only)" for
additional information on battery operation and Battery Charge LEDs and
indicators.
1 or 2 lead-acid batteries.
12 Volt.
Up to 1.25 hours battery capacity typical on two new fully charged
batteries at 25°C, depending on modules used in the product.
Charging time is 4 hours to 90% of full capacity if the monitor is off.
Trends/ Module
Setup
Calc
Delayed
Record
Battery
Charging
When AC is connected and the monitor is on, the Battery Charge
V26CT/V24CT Power Supply
Battery
Charged
The CMS and V24 and V26 Patient Monitors 1-15
Confirm
AC
Power