12v battery 9ah

Prostar GP9-12 rechargeable agm sealed lead acid 12v battery 9ah

Valve Regulated Lead Battery | 12V 9AH | Maintenance-free |Dimension: 151x65x95x101mm

SKU: GP9-12 Category:

Prostar GP9-12 rechargeable agm sealed lead acid 12v battery 9ah is  held in the glass mats, as opposed to freely flooding the plates,which a sealed construction with pressure release valves to prevent gases from escaping.

The storage battery or secondary battery is such a battery where electrical energy can be stored as chemical energy and this chemical energy is then converted to electrical energy as and when required. The conversion of electrical energy into chemical energy by applying external electrical source is known as charging of battery. Whereas conversion of chemical energy into electrical energy for supplying the external load is known as discharging of secondary battery.

AGM battery differs from flooded lead–acid batteries in that the electrolyte is held in the glass mats, as opposed to freely flooding the plates. Very thin glass fibers are woven into a mat to increase surface area enough to hold sufficient electrolyte on the cells for their lifetime. The fibers that compose the fine glass mat do not absorb nor are they affected by the acidic electrolyte. These mats are wrung out 2–5% after being soaked in acids, prior to manufacture completion and sealing.

Lead-acid batteries are composed of a Lead-dioxide cathode, a sponge metallic Lead anode and a Sulphuric acid solution electrolyte. This heavy metal element makes them toxic and improper disposal can be hazardous to the environment.

12v battery 9ah

Features of Sealed Lead Acid Batteries

1. Sealed/Maintenance-free

The valve regulated spill proof construction allows trouble-free safe operation in any position. There is no need to add electrolyte, as gases generated during the charge phase are recombined in a unique “ oxygen cycle”.

Prostar sealed lead acid battery can be operated in virtually any orientation without the loss of capacity or electrolyte leakage. However, upside down operation is not recommended.

2. Long Shelf Life

A low self-discharge rate, up to approximately 3% per month, may allow storage of fully charged batteries for up to a year, depending on storage temperatures, before charging becomes critical. However, we strongly recommend that all batteries should be recharged within six months of receipt as it will enhance their long term life.

3. Design Flexibility

Same model batteries may be used in series and/or parallel to obtain choice of voltage and capacity. The same battery may be used in either cyclic or standby applications.

4. Deep Discharge Recovery

Special separators, advanced plate composition and a carefully balanced electrolyte system ensure that the battery has the ability to recover from excessively deep discharge.

5. Economical

The high watt-hour per dollar value is made possible by the materials used in a sealed lead-acid battery; they are readily available and low in cost.

6. Easy Handling

No special handling precautions or shipping containers, surface or air, are required due to the leak-proof construction.

7. Compact

Prostar batteries utilize state of the art design, high grade materials, and a carefully controlled plate-making process to provide excellent output per cell. The high energy density results in superior power/volume and power/weight ratios.

8. Low Pressure Valve Regulators

All batteries feature a series of low pressure one-way relief valves. These valves safely release any excessive accumulation of gas inside the battery and then reseal.

9. High Discharge Rate

Low internal resistance allows discharge currents of up to 10 times the rated capacity of the battery. Relatively small batteries may thus be specified in applications requiring high peak currents.

10. Rugged Construction

The high impact resistant battery case is made of nonconductive ABS plastic. The case materials impart great resistance to shock, vibration, chemicals and heat.

Battery Construction

Battery Construction



Depending on the model, batteries come either with AMP Faston type terminals made of tin plated brass, post type terminals of the same composition with threaded nut and bolt hardware, or heavy duty flag terminals made of lead alloy.


Immobilized dilute sulfuric acid: H2S04.

Leakproof Design & Operational Safety

The leak proof construction of Prostar batteries has ensured that our batteries have been approved for shipment by air.

Plates (electrodes)

Prostar utilizes the latest technology and equipment to cast grids from a lead-calcium alloy free of antimony. The small amount of calcium and tin in the grid alloy imparts strength to the plate and guarantees durability even in extensive cycle service. Lead dioxide paste is added to the grid to form the electrically active material.

Relief valve

In case of excessive gas pressure build-up inside the battery, the relief valve will open and relieve the pressure. The one-way valve

not only ensures that no air gets into the battery where the oxygen would react with the plates causing internal discharge, but also represents an important safety device in the event of excessive overcharge.

Vent release pressure is between 2-6 psi; the seal ring material is neoprene rubber.

Leakproof Design & Operational Safety

The leak proof construction of Prostar batteries has ensured that our batteries have been approved for shipment by air.


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.

This case has molded-in dividers for each 2 volt cell.


Prostar battery separators are made of non-woven glass fiber cloth with high heat and oxidation resistance. The material further offers superior electrolyte absorption and retaining ability, as well as excellent ion conductivity.

Case Sealing

Depending on the model the case sealing is ultrasonic, epoxy or heat

Performance Characteristics

battery performance characteristics

battery performance characteristics

Battery Terminal

Battery Terminal

Battery Terminal

Battery Terminal

Battery Applications

  • Automotive and traction applications.
  • Standby/Back-up/Emergency power for electrical installations.
  • Submarines
  • UPS (Uninterruptible Power Supplies)
  • Lighting
  • High current drain applications.
  • Sealed battery types available for use in portable equipment.
  • Grid scale energy storage

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Nominal Voltage 12V
 Nominal Capacity (20 hour rate) 9Ah


10 hour rate (0.81A) 8.1Ah
5 hour rate (1.51A) 7.55Ah
1 hour rate (5.61A) 5.61Ah
Internal Resistance Full Charged Battery 25℃ ≤20mΩ
Capacity affected by Temperature

(10 hour )

40℃ (104°F) 102%
25℃ (77°F) 100%
0℃ (32°F) 85%
-15℃ (5°F) 65%

25℃(77°F) Capacity

after 3 month storage 90%
after 6 month storage 80%
after 12 month storage 62%
Charge (Constant Voltage) 25℃(77°F) Float Initial Charging Current Less than2.55A

Voltage 13.6-13.8V

Cycle Initial Charging Current Less than2.55A

Voltage 14.4-15.0V


Battery Dimensions Length 151mm
Width 65mm
Height 95mm
Total Height 101mm
Box Dimensions Length 364mm
Width 165mm
Height 141mm
Quantity Per Box 5 pcs per box
Net weight Per Cell 2.35kg±100g
Net weight Per Box 11.75kg
Gross Weight 12.2kg

Discharge Constant Current per Cell (Amperes at 77°F25°C)

F.V/Time 5min 10min 15min 30min 45min 1h 2h 3h 5h 8h 10h 20h
1.60V 28.05 18.70 14.07 9.35 6.55 5.61 3.51 2.40 1.60 1.08 0.89 0.47
1.65V 27.54 18.36 13.81 9.18 6.43 5.51 3.44 2.36 1.57 1.06 0.87 0.46
1.70V 27.03 18.02 13.56 9.01 6.31 5.41 3.38 2.32 1.54 1.04 0.86 0.45
1.75V 26.52 17.68 13.30 8.84 6.19 5.30 3.32 2.27 1.51 1.02 0.84 0.44
1.80V 25.50 17.00 12.79 8.50 5.95 5.10 3.19 2.18 1.46 0.98 0.81 0.43

Discharge Constant Power per Cell (Watts at 77°F 25°C)

F.V/Time 5min 10min 15min 30min 45min 1h 2h 3h 5h 8h 10h 20h
1.60V 54.00 36.00 27.09 18.00 12.60 10.80 6.75 4.63 3.08 2.07 1.71 0.90
1.65V 53.01 35.34 26.59 17.67 12.37 10.60 6.63 4.54 3.03 2.04 1.68 0.88
1.70V 52.03 34.69 26.10 17.34 12.14 10.41 6.50 4.46 2.97 2.00 1.65 0.87
1.75V 51.05 34.03 25.61 17.02 11.91 10.21 6.38 4.37 2.92 1.96 1.62 0.85
1.80V 49.09 32.73 24.62 16.36 11.45 9.82 6.14 4.21 2.80 1.88 1.56 0.82