FG250-12 best sealed deep cycle lead acid battery 12v 250ah

VRLA Battery 12V 250AH | Dimension: 520x268x220x224mm

SKU: FG250-12 Category:

GRANKIA FG250-12 best sealed deep cycle lead acid battery 12v 250ah is to charge and discharge regularly, and provide a steady stream of power.

The sealed deep cycle lead acid battery 12v 250ah is made up of cells, each cell consists of plates immersed in an electrolyte of dilute sulfuric acid.

GRANKIA utilizes the latest technology and equipment to cast grids from a lead-calcium alloy free of antimony.

Case and lid material is ABS, high impact, resin with high resistance to chemicals and flammability. Case and cover are made of non-conductive ABS plastic to UL94-HB. Depending on the model the case sealing is ultrasonic, epoxy or heat seal.

FG250-12 best sealed deep cycle lead acid battery 12v 250ah

FG250-12 best sealed deep cycle lead acid battery 12v 250ah

Deep Cycle Lead Acid Battery Features

1.) AGM technology

AGM stands for Absorbent Glass Mat. In these batteries the electrolyte is absorbed into a glass-fibre mat between the plates by capillary action.

2.) Low self-discharge

Storing batteries at lower temperatures. It will reduce the rate of self-discharge and preserves the initial energy.

3.) VRLA technology

VRLA stands for Valve Regulated Lead Acid, which means that the batteries are sealed.

4.) Maintenance-Free Design

Minimises technician time spent at site and on battery related callouts.

5.) Anti Buckle Separators

Internal plate buckling can kill a battery outright or simply reduce its lifespan. Our AGM separators gives the plates extra support to eliminate buckling.

VRLA Battery Applications

  • Uninterrupted power supply(UPS)
  • Automotive and traction applications
  • Lighting equipment, fire alarms and security systems
  • Communication and telecom system
  • Solar energy system
  • High current drain applications
  • Fire alarms and security systems
  • Portable VTR/TV, tape recorders, radios, etc.
  • Various power toys and recreational equipment
  • Emergency power supplies in power generation plants and substations
  • Golf Cart

AGM Battery Details

sealed lead acid battery 12v copper terminalReliable and high performance lead acid battery

AGM lead acid battery in series or in parallel connection

Battery Storage Characteristics

Lead Acid Battery Discharge Characteristics Lead Acid Battery Charging Characteristics
Lead acid battery effect of temperature on capacity Lead acid battery self discharge characteristics
Lead acid battery relationship for open circuit voltage and residual capacity Lead acid battery the relationship for charging voltage and temperature
Lead acid battery floating life on temperature Lead acid battery cycle life on DOD

Deep Cycle Battery FAQ

  1. Are lead-acid deep cycle batteries good?

    Deep cycle batteries are to be discharged and recharged regularly. They have strong plates inside of them that allow their power to be completely drained repeatedly without causing damage to the battery itself.

  2. Should you keep lead acid battery fully charged?

    Lead acid batteries must always be stored in a charged state. A topping charge should be applied every 6 months to prevent the voltage from dropping below 2.05V/cell and causing the battery to sulfate.

  3. Can you continuously charge a lead acid battery?

    Overcharging a lead acid battery can be just as harmful as undercharging it. If workers leave the battery in a continuously charging state for long periods of time, corrosion of the positive battery plates can occur.


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Nominal Voltage 12V(6 cells per unit)
Design Floating Life @25℃ 10 Years
Nominal Capacity @25℃(10 hour [email protected],10.80V) 250Ah
Capacity @25℃ 20 hour rate (13.38A,10.5V) 267.6Ah
 5 hour rate (44.0A,10.5V) 220.0Ah
1 hour rate (159.5A,9.6V) 159.5Ah
Internal Resistance Full Charged Battery@25℃ ≤2.6mΩ
Ambient Temperature Discharge -20℃~50℃
Charge -20℃~50℃
Storage -20℃~50℃
Max. Discharge Current@25℃ 2000A(5s)
Capacity affected by Temperature

(10 hr Capacity )

40℃ 102%
25℃ 100%
0℃ 85%
-15℃ 65%
Self-Discharge@25℃ per Month 3%
Charge (Constant Voltage) @25℃ Standby Use Initial Charging Current Less than 50A

Voltage 13.6-13.8V

Cycle Use Initial Charging Current Less than 50A

Voltage 14.4-14.9V


Discharge Constant Current per Cell (Amperes at 25°C)

F.V/Time 15min 30min 45min 1h 2h 3h 5h 6h 8h 10h 20h
1.60V 451.3 265.8 201.3 159.5 93.8 69.0 46.5 40.5 31.8 26.3 13.88
1.67V 426.3 251.8 193.5 154.8 90.8 66.8 45.8 39.8 31.5 25.8 13.75
1.70V 400.3 244.5 186.5 148.8 88.3 65.0 44.8 39.0 31.0 25.5 13.55
1.75V 375.0 233.8 178.3 142.8 86.0 63.5 44.0 38.3 30.5 25.3 13.38
1.80V 351.8 225.3 171.8 137.8 82.8 61.5 43.0 37.5 30.0 25.0 13.25

Discharge Constant Powerper Cell (Watts at25°C)

F.V/Time 15min 30min 45min 1h 2h 3h 5h 6h 8h 10h 20h
1.60V 862.8 527.8 382.3 306.0 177.8 131.8 89.8 78.3 62.0 51.3 27.4
1.67V 825.5 494.8 369.3 297.8 173.0 128.3 88.3 77.0 61.5 50.8 27.2
1.70V 769.3 484.0 357.5 287.5 169.0 125.3 87.0 76.0 60.8 50.3 26.9
1.75V 721.8 460.8 343.3 277.0 165.0 122.8 85.8 74.8 60.0 49.8 26.6
1.80V 677.5 442.0 331.8 268.0 159.5 119.3 84.0 73.5 59.3 49.5 26.4