In heavy-duty industrial and automotive electrical systems, connectivity reliability is the key to energy efficiency. Kamcap's Full Welding Supercapacitor Series is engineered for high-power environments that demand ultra-low internal resistance (ESR) and maximum physical durability.
By eliminating mechanical crimping or standard soldering and utilizing advanced full-penetration welding technology, these high-capacity 1000f supercapacitors and 3000f super capacitors provide superior power transfer, seamless current handling, and outstanding vibration resistance.
| Model | Size （D*H）mm | Rated voltage(V) | Rated capacity(F) | Tolerance % | ESR（AC） @1Hz mΩ | ESR（DC） mΩ | Leakage current (mA 72h 25℃） | Rated current(A) | Maximum current(Amax) | Weight(g) | Power Density P/m （KW/kg） | Energy Density E/m （Wh/Kg） |
| HP-2R7-J307UDJ32 | 35*57 | 2.7 | 300 | 0~+30% | 1 | 1.9 | 1 | 65 | 230 | 66 | 14.5 | 4.6 |
| HP-2R7-J357UDJ33 | 35*65 | 2.7 | 350 | 0~+30% | 0.7 | 1.4 | 1.1 | 80 | 280 | 81 | 16.1 | 4.4 |
| HP-2R7-J407UDJ33 | 35*65 | 2.7 | 400 | ~10~20% | 0.7 | 1.4 | 1.2 | 90 | 300 | 81 | 16.1 | 5.1 |
| HP-2R7-J507UDJ45 | 35*69.9 | 2.7 | 500 | 0~+30% | 0.65 | 1.3 | 1.5 | 107 | 350 | 94 | 14.9 | 5.4 |
| HP-2R7-J607UDJ004 | 35*81.2 | 2.7 | 600 | ~10~20% | 0.65 | 1.3 | 1.7 | 127 | 380 | 101.5 | 13.8 | 6.0 |
| HP-2R7-J727UDJ99 | 35*105.1 | 2.7 | 720 | ~10~20% | 0.1 | 1.1 | 2.0 | 144 | 485 | 132 | 12.5 | 5.5 |
| HP-2R7-J807UDJ99 | 35*105.1 | 2.7 | 800 | ~10~20% | 0.65 | 1.3 | 3.3 | 165 | 510 | 132 | 10.6 | 6.1 |
| HP-2R7-J108UDJ006 | 35*115.2 | 2.7 | 1000 | ~10~20% | 0.55 | 1.1 | 4.5 | 205 | 570 | 145.5 | 11.3 | 6.9 |
| Model | Size （D*H）mm | Rated voltage(V) | Rated capacity(F) | Tolerance % | ESR（AC） @1Hz mΩ | ESR（DC） mΩ | Leakage current (mA 72h 25℃） | Rated current(A) | Maximum current(Amax) | Weight(g) | Power Density P/m （KW/kg） | Energy Density E/m （Wh/Kg） |
| HP-3R0-J307UDJ32 | 35*57 | 3.0 | 300 | 0~+30% | ≤1 | ≤1.9 | 1.2 | 70 | 235 | 66 | 17.9 | 5.7 |
| HP-3R0-J357UDJ33 | 35*65 | 3.0 | 350 | 0~+30% | ≤0.7 | ≤1.4 | 1.3 | 85 | 285 | 81 | 19.8 | 5.4 |
| HP-3R0-J407UDJ33 | 35*65 | 3.0 | 400 | ~10~20% | ≤0.7 | ≤1.4 | 1.4 | 95 | 305 | 81 | 19.8 | 6.1 |
| HP-3R0-J507UDJ45 | 35*69.9 | 3.0 | 500 | 0~+30% | ≤0.65 | ≤1.3 | 1.7 | 112 | 355 | 94 | 18.4 | 6.6 |
| HP-3R0-J607UDJ004 | 35*81.2 | 3.0 | 600 | ~10~20% | ≤0.65 | ≤1.3 | 1.9 | 132 | 385 | 101.5 | 17.0 | 7.4 |
| HP-3R0-J727UDJ99 | 35*105.1 | 3.0 | 720 | ~10~20% | ≤0.6 | ≤1.1 | 2.2 | 149 | 490 | 132 | 15.5 | 6.8 |
| HP-3R0-J807UDJ99 | 35*105.1 | 3.0 | 800 | ~10~20% | ≤0.65 | ≤1.3 | 3.5 | 171 | 530 | 132 | 13.1 | 7.5 |
| HP-3R0-J108UDJ006 | 35*115.2 | 3.0 | 1000 | ~10~20% | ≤0.55 | ≤1.1 | ≤6.0 | 230 | 645 | 145.5 | 14.0 | 8.6 |
| HP-2R7-J357UDJ33（K74） | 35*65 | 2.7V | 350 | ~10~30% | 1 | 2 | 1.7 | 68 | 245 | 75 | 12.1 | 4.7 |
| HP-2R7-J507UDJ45（K74) | 35*69.9 | 2.7V | 500 | ~10~20% | 0.9 | 1.8 | 1.8 | 90 | 305 | 90 | 11.2 | 5.6 |
Kamcap’s full welding high-capacity components are heavily relied upon globally across diverse industrial applications:
Automotive Engine Starters: Acting as a core energy bank inside modern high-performance Supercapacitor Jump Starters to offer instant engine ignition.
Smart Utility Grids & Backup Power: Ensuring reliable RAM backup, smart AMR meter reading, and industrial UPS protection.
Renewable Energy Management: Widely used in solar power regulation and wind turbine pitch control systems to bridge grid volatility.
Q1: What are the main benefits of a full welding supercapacitor compared to laser spot welding or mechanical crimping?
Answer: The full welding technique creates a complete, continuous molecular bond between the internal aluminum terminals, active electrodes, and the outer casing. Compared to standard spot welding or crimping, a full welding supercapacitor offers a drastically lower ESR (Equivalent Series Resistance). This prevents high localized heat buildup, allows the cell to handle much higher continuous and peak currents, and ensures the cell won't suffer from joint fatigue or open circuits under heavy industrial vibrations.
Q2: Why should I choose a 3.0V full welding series over a standard 2.7V model?
Answer: Opting for our 3.0V high-voltage cells (such as our premium 300F to 1000F models) allows you to achieve your targeted system voltage with fewer cells connected in series. This reduces the overall size, weight, and complexity of your balancing circuits and module housing, directly lowering your total B2B manufacturing cost. However, if your application prioritizes the absolute maximum cycle life under standard ambient conditions, our classic 2.7V 3000f super capacitor cells remain the industry benchmark for extreme longevity.
Q3: Do you offer customized module balancing for the 1000F and 3000F super capacitor series?
Answer: Yes, absolutely. As a leading global 3000f supercapacitor manufacture provider, Kamcap offers fully customized voltage balancing solutions. Depending on your project requirements, we can integrate active balancing circuits, passive resistor balancing, or over-voltage protection management into your custom arrays. If your project demands complex multi-cell configurations for heavy power backup, you can explore our complete Module Series to find pre-engineered commercial solutions.
Q4: Can these large-capacity capacitors be used directly for vehicle emergency jump starting?
Answer: Yes, our Jump Starter Special Series (such as the HP-2R7-J357UDJ33 and HP-2R7-J507UDJ45) is specifically optimized with heavy-duty internal construction to deliver massive cold-cranking Amps. These full welding cells are the exact core energy components used globally to manufacture premium, battery-less emergency car starters. For a detailed breakdown of how these cells perform in automotive environments, read our application analysis on Supercapacitor Vehicle Starters.
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