NSTG Series – Tubular GEL VRLA Battery
The NSTG Series from Nesol Energies Pvt. Ltd. represents a new generation of Tubular GEL VRLA batteries, engineered for applications that demand long cycle life, high temperature resilience, and truly maintenance-free performance.
Designed with a refined chemical system and precision-built components, the NSTG range combines:
- Advanced tubular positive plates for superior deep-cycle durability
- Highly stable thixotropic gel electrolyte that eliminates stratification
- High-efficiency VRLA oxygen recombination technology, ensuring zero water loss
- Rugged mechanical design, suitable for solar, telecom, industrial and standby power systems
The NSTG series delivers consistent output, excellent charge recovery and reliable performance even in harsh climatic conditions.
Key Features
Tubular positive plates for best-in-class cycle life
Gel electrolyte — non-spillable, no stratification
Factory-filled, factory-charged, ready to install
VRLA design ensures zero top-up
Antimony-free alloy – low gassing & longer life
Excellent thermal management for high temperature zones
Can be installed horizontally or vertically
Manufactured under ISO 9001 certified quality system
12V Tubular GEL Monoblocs
| Model | Voltage | Capacity (C10 Ah) | Length (mm) | Width (mm) | Height (mm) | Weight (Kg) |
|---|---|---|---|---|---|---|
| 12 NSTG 40 | 12V | 40 Ah | 410 | 173 | 255 | 20.0 |
| 12 NSTG 60 | 12V | 60 Ah | 512 | 212 | 255 | 21.5 |
| 12 NSTG 80 | 12V | 80 Ah | 503 | 191 | 430 | 23.0 |
| 12 NSTG 100 | 12V | 100 Ah | 503 | 191 | 430 | 24.5 |
| 12 NSTG 150 | 12V | 150 Ah | 503 | 191 | 430 | 45–62* |
*Weight variation depends on internal plate configuration.
2V GEL VRLA Battery
| Model | Capacity (AH) @ 27°C | Dimensions (mm) ± 3mm | Normal Charging Current | Short Circuit Current (A) | Internal Resistance (mΩ) | Battery Weight (Kg) ± 2% | |||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 20 hr 10.5V |
10 hr 10.5V |
5 hr 10.5V |
3 hr 10.2V |
1 hr 10.2V |
Length | Width | Height | Total Height | |||||
| NESGEL-100 | 12.00 | 10.00 | 9.00 | 8.00 | 7.00 | 198 | 130 | 237 | 237 | 2A | 400 | 16 | 8.5 |
| NESGEL-200 | 22.00 | 20.00 | 19.00 | 18.00 | 17.00 | 260 | 172 | 225 | 225 | 3A | 500 | 16 | 15 |
| NESGEL-400 | 37.00 | 35.00 | 29.05 | 25.20 | 19.25 | 197 | 165 | 151 | 179 | 3.5A | 555 | 14.5 | 24 |
| NESGEL-500 | 53.00 | 50.00 | 41.50 | 36.00 | 27.50 | 349 | 167 | 158 | 193 | 5.0A | 795 | 13.8 | 26 |
| NESGEL-600 | 68.00 | 60.00 | 53.95 | 46.80 | 35.75 | 331 | 173 | 194 | 225 | 6.5A | 1020 | 11.5 | 32 |
| NESGEL-750 | 90.00 | 70.00 | 70.55 | 61.20 | 46.75 | 405 | 172 | 190 | 236 | 8.5A | 1350 | 9.2 | 36 |
| NESGEL-1000 | 105.00 | 100.00 | 83.00 | 72.00 | 55.00 | 484 | 170 | 210 | 240 | 10.0A | 1575 | 8.6 | 42 |
| NESGEL-1500 | 131.00 | 125.00 | 103.75 | 90.00 | 68.75 | 522 | 239 | 200 | 226 | 12.5A | 1875 | 6.9 | 45 |
| NESGEL-1800 | 158.00 | 150.00 | 124.50 | 108.00 | 82.50 | 522 | 239 | 200 | 226 | 15.0A | 2250 | 5.75 | 62 |
| NESGEL-2000 | 184.00 | 175.00 | 145.25 | 126.00 | 96.25 | 522 | 239 | 200 | 226 | 17.5A | 2760 | 4.6 | 68 |
| NESGEL-2500 | 210.00 | 200.00 | 166.00 | 144.00 | 110.00 | 522 | 239 | 200 | 226 | 20.0A | 3150 | 4.0 | 72 |
*Specifications are under continuous improvement. Subject to change without notice.
(Amps to 1.75 V/Cell / 10.5 V per Monobloc*)
The following table presents the discharge current capability of the NSTG Series Tubular GEL VRLA Batteries at C10 rated capacity. Values represent the maximum sustainable current (in Amperes) for different discharge durations at 25°C, for a fully charged battery.
Discharge Current (Amperes) Across Various Durations
| Model | Rated Capacity (C10 Ah) | 1 Hr | 1.5 Hr | 2 Hr | 3 Hr | 4 Hr | 5 Hr | 6 Hr | 7 Hr | 8 Hr | 9 Hr | 10 Hr |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 12 NSTG 40 | 40 Ah | 22.0 | 16.8 | 14.0 | 10.0 | 8.0 | 6.6 | 5.6 | 5.2 | 4.8 | 4.4 | 4.0 |
| 12 NSTG 60 | 60 Ah | 33.0 | 25.2 | 21.0 | 15.0 | 12.0 | 9.9 | 8.4 | 7.8 | 7.2 | 6.6 | 6.0 |
| 12 NSTG 80 | 80 Ah | 44.0 | 33.6 | 28.0 | 20.0 | 16.0 | 13.2 | 11.2 | 10.4 | 9.6 | 8.8 | 8.0 |
| 12 NSTG 100 | 100 Ah | 55.0 | 42.0 | 35.0 | 25.0 | 20.0 | 16.5 | 14.0 | 13.0 | 12.0 | 11.0 | 10.0 |
| 12 NSTG 150 | 150 Ah | 82.5 | 63.0 | 52.5 | 37.5 | 30.0 | 24.8 | 21.0 | 19.5 | 18.0 | 16.5 | 15.0 |
*Performance values correspond to a fully charged battery tested at 25°C.
Electrical & Performance Characteristics
| Parameter | 12V Monobloc |
|---|---|
| Design Float Life @ 25°C | 8 years |
| Cycle Life @ 80% DOD | 1200 cycles |
| Cycle Life @ 20% DOD | 3500 cycles |
Operating Temperature Range -20°C to +55°C
Recommended Charging Parameters
- Float Voltage: 2.250 ± 0.050 V/cell @ 25°C
- Boost Voltage: 2.300 ± 0.050 V/cell @ 25°C
- Charging Current Limit: 0.1 C10 (min) to 0.2 C10 (max)
- Ripple: < 3% RMS
- Float → Boost Shift: Charging current >5% of C10
- Boost → Float Shift: Charging current <3% of C10
Working Principle – Oxygen Recombination System
NSTG batteries operate on an advanced internal oxygen recombination mechanism that eliminates the need for water topping.
How the Process Works:
- During charging, oxygen evolves at the positive plate.
- The gel matrix develops micro-channels that transport oxygen to the negative plate.
- At the negative plate: Pb + ½O₂ → PbO
- PbO reacts with sulphuric acid to form lead sulphate and water: PbO + H₂SO₄ → PbSO₄ + H₂O
- During recharge, the lead sulphate reconverts into spongy lead, restoring electrolyte balance.
This closed-loop reaction ensures:
- Zero water loss
- No acid mist emission
- Longer operational life
Benefits
- Strong deep-cycle performance & fast recovery
- No water top-up required throughout service life
- Very low self-discharge → long shelf life
- Minimal grid corrosion → extended lifespan
- 100% rated capacity available from first cycle
- Suitable for PSOC (partial state of charge) usage
- Certified for IS 15549 & IEC 61427
- UL-recognized plastic components
Applications
Standby Power
- Power generation & substations
- UPS / EPABX
- Remote monitoring systems
- Navigation & offshore equipment
Solar / SPV
- Solar home lighting
- Rural electrification
- Street lighting
- Hybrid renewable systems
Telecom & Communication
- BTS sites
- Wireless transmission
- Switching systems
Also ideal for deep cycling, elevated temperature zones and critical backup operations.
Constructional Details
- High-pressure die-cast spine grid using lead–calcium–tin alloy
- Woven polyester gauntlet for active material retention
- Designed for extended cycle life and superior structural strength
- Lead–calcium alloy grid
- Special long-life expander blend for improved charge acceptance and reduced sulphation
- Microporous synthetic separator with AGM reinforcement
- Facilitates oxygen transfer required for efficient VRLA recombination
- Thixotropic gelled sulphuric acid
- Non-spill, vibration-resistant, and free from acid stratification
- Flame-retardant polypropylene (FR-PP)
- Heat-resistant, robust and completely leak-proof
- Factory-set VRLA safety valve
- Self-releasing, explosion-proof, with flame arrestor for enhanced safety
- Epoxy-sealed
- Threaded lead-plated copper inserts ensure low resistance and long service reliability
- Acid-resistant, epoxy powder-coated
- Modular, stackable design for quick installation
- Lead-plated, insulated copper connectors for minimal voltage drop
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