Prostar GM500-2 deep cycle vrla 2v 500ah agm battery cost

AGM has very low internal resistance, is capable to deliver high currents on demand and offers a relatively long service life, even when deep cycled.

SKU: GM500-2 Category:

Prostar GM500-2 deep cycle vrla 2v 500ah agm battery is made of individual cells each providing 2 Volt. By combining multiple cells, batteries of nearly every voltage and capacity can be made. Depending on the capacity of the cell, one, two or four connection points for the positive and negative connections are available. Due to the flexible design, the final shape of the battery can be adapted to the space available. The cells can be placed in any direction, creating a system with all connections on the front so it enables easy checking of individual cell voltages and the torque of the connections.

2v battery cells from the world’s leading manufacturers independently sourced, giving you the customer the advantage of knowing that you are being offered the correct battery for your application. At Pb Batteries we pride ourselves on making sure we help you identify your current battery or requirement and supply you with the correct product.

agm battery Prostar GM500-2 deep cycle vrla 2v 500ah agm battery cost GM500 2

AGM (Absorbed Glass Mat) sealed battery technology was originally invented in 1980, and developed and introduced in 1985 for military aircraft where power, weight, safety, and reliability were paramount considerations. The Concorde AGM batteries are VRSLAB (Valve Regulated Sealed Lead-Acid Battery), sometimes referred to as VRLA (Valve Regulated Lead-Acid).

Prostar GM500-2 deep cycle vrla 2v 500ah agm battery has a lifespan of between three and five years, based this calculation on several factors including the number of loading/unloading cycles and environmental factors.

Battery Structure

agm battery Prostar GM500-2 deep cycle vrla 2v 500ah agm battery cost Battery Structure

Battery Construction

Positive Plate Flat plate with lead dioxide
Negative Plate Flat plate with lead
Technology Absorbent glass mat (AGM)
Separator Fiberglass
Electrolyte Sulfuric acid
Container ABS
Safety Valve Self resealing, pressure regulated and explosion proof
Terminals Copper
Operating Temperature Nominal Operating Temperature : 25℃(77℉)
Discharge : -20℃ ~ 50℃ (-4℉~122℉)
Charge: 0℃ ~ 40℃ (32℉~104℉)
Storage: -20℃ ~ 40℃ (-4℉~104℉)
Float Voltage 2.23 – 2.27 V/cell
Equalize Voltage 2.33 – 2.37 V/cell
Mounting Orientation Horizontal only
Intercell Connectors Lead plated copper bars
Self Discharge Less than 10% after 90 days, can be stored up to 6 months at 25℃ (77℉);
Fully recharging is required before usage, and charged sooner if stored at higher temperature than 25℃ (77℉).
Design Life Up to 15 Years in Standby Service at 25℃
Eurobat (20℃) : 12 years and longer, Long Life

Battery Terminal

agm battery Prostar GM500-2 deep cycle vrla 2v 500ah agm battery cost Battery Terminal

2 Volt Battery Applications


  • Security and Alarm Systems
  • Industrial Control and Automation Systems
  • Train embedded Systems
  • Remote telemetry Systems
  • Power for auxiliary equipment in: Motorhomes, Caravans, Boats, Camping, etc.
  • Gas, smoke and fumes detectors


  • UPS – Uninterruptible Power Supplies
  • Public Telecommunications Central Exchange
  • Private PABX
  • Network data transmission – Telephone networks, Cable TV networks, Internet and Intranet
  • Data Centers
  • Call Centers
  • Central Power in large buildings – Hospitals, Hotels, places of public assistance, etc.
  • Tolls and Automatic Barriers for vehicles control
  • Ticketing

Some advices to maximize batteries lifetime:

Make sure to keep the batteries in a cool, dry and well ventilated location. Ideally, the temperature of the site should not exceed 24 degrees Celsius. For good ventilation, there must be a space between batteries to ensure adequate air circulation.

Do not store batteries for long periods of time. New batteries can be stored for 6 to 12 months. After this period, the battery should be used or a large percentage of their carrying capacity will be lost. It is not recommended to storage batteries that have already been used.

When using batteries in a UPS, does not exceed 80% of its rated capacity due to decreased autonomy – when the load increases, the autonomy decreases. In case of power failure, a UPS with a load equivalent to full capacity consumes and discharges the batteries quickly, reducing its lifespan.

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2 Volt Battery Characteristics

Nominal Voltage 2V
 Nominal Capacity (10 hour rate) 500Ah
20 hour rate (26.5A) 530Ah
5 hour rate (88.4A) 442Ah
1 hour rate (275A) 275Ah
Internal Resistance Full Charged Battery 25℃ ≤0.31mΩ
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 than 75A
Voltage 2.23-2.27V
Cycle Initial Charging Current Less than 75A
Voltage 2.33-2.37V

2 Volt Battery Package

Battery Dimensions Length 241mm
Width 172mm
Height 330mm
Total Height 366mm
Box Dimensions Length 256mm
Width 186mm
Height 423mm
Quantity Per Box 1 PC per box
Net weight Per Cell 31.0 kg±500g
Net weight Per Box 31.0kg
Gross Weight 32.0kg

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

F.V/Time 5min 10min 15min 30min 45min 1h 2h 3h 5h 8h 10h 20h
1.60V 1397 902 748 495 369 275 215 137.5 93.5 61.6 55 29.2
1.65V 1372 886 734 486 362 270 211 135 91.8 60.5 54 28.6
1.70V 1346 869 721 477 355 265 207 132.5 90.1 59.4 53 28.1
1.75V 1321 853 707 468 348 260 203 130 88.4 58.2 52 27.6
1.80V 1270 820 680 450 335 250 195 125 85 56 50 26.5

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

F.V/Time 5min 10min 15min 30min 45min 1h 2h 3h 5h 8h 10h 20h
1.60V 2689 1736 1440 953 709 529 413 264.7 180 118.6 105.9 56.1
1.65V 2640 1705 1414 936 696 520 405 259.9 176.7 116.4 104 55.1
1.70V 2591 1673 1388 918 684 510 398 255.1 173.4 114.3 102 54.1
1.75V 2543 1642 1361 901 671 501 390 250.3 170.2 112.1 100.1 53.1
1.80V 2445 1579 1309 866 645 481 375 240.6 163.6 107.8 96.3 51