8.4V 5A Li-ion Battery Charger for 2S 7.4V Battery
Phonix® FX8405000 | Heavy-Duty 8.4V 5A Fast Charger for 2S 7.4V Battery Packs
Engineered for industrial-grade, high-capacity 2S Lithium-ion/LiPo thermal and current management.
• High-Current CC Stage: Fast 5A continuous output optimized for heavy-drain systems.
• Advanced Overcurrent & Short Protection with auto-resetting micro-fuses.
• Heavy-duty PC/ABS impact-resistant enclosure with passive natural convection dissipation.
• Fully compliant with international regulatory benchmarks: CE, UL, TUV, FCC, PSE, CCC.
• Designed for high-drain robotics, ruggedized instrumentation, and specialized industrial portable hardware.
Description
8.4V 5A Li-ion Battery Charger Specification
Adaptor for: 2S 7.4V Li-ion Battery
Model: FX8405000
AC Input: 100~240V
DC Output: 8.4V 5A
Application: 2S 7.4V Li-ion Battery
Charge Process: Pre-charge, CC, CV and Automatically Cut-off
Charger Indicator: With Double color LED for power capacity show
Output Protections: OVP, OCP, Shorted, Reversed Protection
Safety Approval: CE, UL, TUV, FCC, PSE, CCC
Size: 133*58*31mm
Net Weight: 400g
Industry: Security System, Lighting Industry
Brand: Phonix®
| FX8405000 8.4V 5A Li-ion Battery Charger for 2S Li-ion Batteries Specification | ||
| Item | Specification | Remark |
| 1.Input | ||
| Rating input voltage | 100~240 Vac 50/60 Hz | |
| Input voltage range | 90~264 Vac | |
| Rating input current | 1.0 A/RMS | Input:100V Output: Full load |
| Max input power | 52 W | Input:100V Output: Full load |
| 2.Output | ||
| No load output voltage | DC 8.4 V | |
| Output voltage range | DC 7.4V~8.4 V | |
| Charging voltage | DC 8.4 V ±0.2 V | |
| Charging current | 5 A ±10% | |
| Pre-charge | 0.5A ±0.1 A | Voltage ≤ 6V |
| Charge-end current | ≤0.5 A ±10% | |
| Suit with battery type | 2S Li-ion battery | |
| Timer | – | |
| Max output power | 45 W | |
| Ripple voltage | ≤168mV | Full load |
| Power LED | Red | Power on |
| Charging LED | All off | No battery |
| All on | Finished | |
| All flashing | Error | |
| Flashing one by one | Charging | |
| Shorted | Yes | |
| Reversed | Yes | |
| Efficiency | ≥85% | Full load @220V |
| 3.Environment | ||
| Operate temperature | -10 ~ +40℃ | |
| Operate humidity | < +90% | Relative humidity |
| Storage temperature | -40 ~ +70℃ | |
| Storage humidity | 0 ~ +95% | Relative humidity |
| Cooling | Natural | |
| Vibration resistance | 5MM / 50HZ/600S | Non-operating condition |
| Impact resistance | 1 meter drop test 3 times | Non-operating condition |
| 4.Mechanical | ||
| Weight | 400g | |
| Size | 133*58*31mm | Casing only |
| Connector | Refer to order | |
| 5.Safety | ||
| Max. temperature rise | < 40℃ on casing | |
| Safety approval | CE/TUV/FCC/PSE/CCC | |
| MTBF | 30000 H | |
| ESD | 8.0 KV | |
| Hi-Pot Insulation | i/p to o/p: 3000V (1 min) | |
Engineering & Integration Q&A
How does the FX8405000 manage thermal dissipation at a continuous 5A output without active fan cooling?
Our hardware engineers optimized the internal PCB layout by separating the primary switching transformer from the secondary rectification circuit, reducing localized heat concentration. The rugged outer casing is injection-molded from high-thermal-conductivity PC/ABS materials, utilizing optimized passive natural convection to keep the outer casing temperature rise well below 40°C under 100% full-load (52W max input power) testing.
Is a 5A charge rate safe for all 2S 7.4V lithium battery configurations?
A 5A charge current is classified as a fast-charge solution and is ideally recommended for 2S battery packs with a total capacity of 10Ah or greater, or cells rated for higher C-rate charging. For deeply drained packs where the voltage has fallen ≤ 6V, the charger automatically initiates a reduced 0.5A pre-charge conditioning current to stabilize the internal chemistry before ramping up to the full 5A Constant Current phase.
What specific parameters dictate the transition from constant voltage to the final cut-off?
The FX8405000 relies on precise current-threshold termination rather than simple timers. Once the 2S battery pack voltage reaches its peak at 8.4V (±0.2V), the charger maintains this plateau (Constant Voltage stage) while the current tapers down. The automatic cut-off triggers precisely when the charge current drops below the ≤ 0.5A threshold, entering an absolute open-loop state to prevent overcharging.
Does this heavy-duty unit tolerate erratic input voltages in field environments?
Yes. The input stage features an industrial wide-range switch-mode design that treats raw inputs from 90Vac up to 264Vac (50/60 Hz). Additionally, the system is reinforced with 8.0KV ESD protection and a 3000V Hi-Pot insulation rating, shielding both the internal micro-components and your connected equipment from line surges and static discharge.
Industrial Deployment & Customization Specifications
Given the heavy 5A delivery profile, the FX8405000 is engineered to replace low-current standard adapters in critical infrastructure applications:
| Robotics & AGVs | Warehouse automated guided vehicles, robotic arms, and military/EOD remote units running 2S battery topologies. |
| High-Output Marine & Lighting | Professional diving arrays, industrial-grade LED site lighting, and high-intensity mining hardware requiring quick turn-around charging. |
| Remote Telemetry | Field testing equipment, remote telecom base monitoring systems, and heavy-duty environmental scanner housing. |
OEM/ODM Configuration Options for Bulk Buyers
Because high-current connections demand minimal contact resistance, Phonix® provides specialized factory-terminated connector assemblies based on your engineering drawings. Available configurations include heavy-duty XT60, Anderson Powerpoles, 3-Pin XLR, and ruggedized threaded aviation plugs. All units carry a 30,000-hour MTBF rating and are covered by our 3-year factory warranty. Contact our B2B commercial desk to request custom wire-gauge (AWG) modifications, localized AC mains cords, and wholesale tiered quotes.
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