Daktronics P1753, Display Manual

Battery Care and Charging

8

The charge cycle is as follows:

1� 

Soft Start

 – Charger verifies connections are good and the battery is capable of 

accepting a charge. Batteries with very low voltage (near dead) will be slowly 

charged to not harm the battery. When the battery voltage reaches 10 V for 30 

seconds, the charger switches to the next stage.

2� 

Bulk Stage

 – the charger uses constant current and charges the battery to 14.3 V. 

When the battery holds the voltage of 14.3 V for 30 seconds, the charger switches to 

the next stage.

3� 

Absorption Stage

 – the charger uses constant voltage to charge the battery until the 

charge current drops just below the rated current for 30 seconds. At this point the 

charger will go to the next stage.

4� 

Float Stage

 – the charger finishes the charge cycle by keeping the battery at 13.3 V 

for a period of time and determines the battery is charged and shuts down.

5� 

Maintenance

 – the charger will monitor the battery and if the battery voltage drops 

below 12.8 V or if 14 days have passed since the last charge the charge cycle will 

start automatically.

Unlike most automotive "trickle" chargers, the unit will not boil off the electrolyte in a lead-

acid battery when left unattended. 
To operate the charger, simply plug the display's power cord into a standard 120 VAC, 

60 Hz outlet. Red and green LED indicators on the charger, visible through holes on the 

rear of the display cabinet, indicate the recharging status. A label at this location also 

describes charging levels. 

Note: 

When the batteries are connected, they will continuously supply power, even 

if the digits are blank. Make sure that the display is powered 

ON

 only during an 

event or when testing. At all other times, the display should be powered 

OFF

. 

The table below describes how the charger indicators operate:

LED Indicators

Operating Condition

Soft Start / Bulk Charge

          Red ON

          Green OFF

Charger is in the “Soft Start” or “Bulk Stage” and the battery is 

being charged. If the red LED stays on for more than 24 hours, 

refer to the 

Charger Troubleshooting Table (p.9)

.

Absorption Charge

          Red ON

          Green ON

Charger is in the “Absorption Stage” and delivering constant 

voltage to the battery. If both LEDs stay on longer than 24 hours, 

refer to the 

Charger Troubleshooting Table (p.9)

.

Float Charge

          Red OFF

          Green ON

The charger has moved to the “Float Stage” and is topping off 

the charge to the battery and keeping the battery ready to 

use. The green light indicates your battery is ready to use. If the 

green LED stays on and the battery is known to be low, refer to 

the 

Charger Troubleshooting Table (p.9)

.

Maintenance

The charger will monitor the battery, and if the battery voltage 

drops below 12.8 V for 30 seconds or if 14 days have passed 

since the last charge, the charge cycle will start automatically 

and will switch back to “Bulk Stage”.