Philips V24CT User's Reference Manual page 358

AC and DC (Battery) Operation
Note—
LEDs may take some time to cycle to the appropriate charge indication.
The V24CT or V26CT may under report 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.
Battery LED Pattern
Residual Capacity
Up to 30-40%
More than 30-40%, Less then 90% Steady
More than 90%
Full
12-4 Battery Information (V24CT and V26CT only)
When AC is connected and the monitor is on, the Battery Charge
• A fully depleted battery will charge to 90% of full capacity in 4
hours when the monitor is not being used. When the monitor is in
use, it will take approximately 16 hours to charge the batteries to
90%.
• To preserve battery integrity, the battery must be fully charged
each time the battery is depleted.
• A new battery or one that has been stored for an extended period
requires 4 hours of charging before use.
• To operate on internal battery power only, disconnect the power
cord from the AC outlet.
• Batteries should be discarded if there are visual signs of damage
• Life expectancy of a battery depends on the frequency and
duration of use. When properly maintained and stored, the life
expectancy of a battery is about 1.5 years. For more aggressive use
models, life-expectancy may be less. Philips recommends
replacing sealed lead acid batteries once a year. The date of
manufacture can be found on the battery. It is coded as yymmdd.
Charging LED Charged LED
Flashing Off
Off
Off Steady
Off Steady