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Battery Tender 4120 Charge N Start - 1200A Jump Starter & 4A Smart Charger | Tech Battery Solutions
Battery Tender 4120 Charge N Start - 1200A Jump Starter & 4A Smart Charger | Tech Battery Solutions
Battery Tender® Charge N Start 4120 - 1200A Jump Starter with 4 AMP Smart Charger
Stop Dead Batteries Before They Start
Your battery's dead again. Maybe it's your motorcycle after winter storage, your RV after sitting for months, or your car after a week of not driving. The Charge N Start 4120 eliminates the choice between carrying a bulky jump starter OR maintaining your battery with a trickle charger. Revolutionary Auto-Switch technology automatically maintains both your vehicle battery AND the internal jump starter—no manual intervention required.
Complete Technical Specifications
| Battery Tender Charge N Start 4120 Technical Data | |
|---|---|
| Charging Output | 12V @ 4 AMP continuous |
| Jump Starting Power | 1200 Peak Amps |
| Engine Capacity | Up to 6.0L gasoline or 4.0L diesel |
| Battery Chemistry Support | AGM, GEL, Lithium, Flooded Lead-Acid |
| Charging Technology | ISM (Infinite Sequential Monitoring) |
| Input Voltage | 120V AC, 50/60 Hz |
| AC Power Cord | 6 ft, 18 AWG |
| DC Output Cord | 6 ft, 18 AWG |
| DC Accessory Cord | 2 ft, 16 AWG |
| Total Reach | Over 14 feet |
| Smart Clamps | Heavy-duty with copper-plated jaws |
| LED Indicators | Red (charging), Yellow (absorption), Green (float maintenance) |
| Emergency Light | Built-in LED |
| Safety Features | Spark-proof, reverse polarity protection, short circuit protection, temperature compensation |
| Safety Certifications | cETLUS (UL1236), cETLUS (UL2743), DOE, FCC, ICES, UN38.3 |
| Storage Case | Premium protective case included |
| Warranty | 1 Year manufacturer's warranty |
Why Auto-Switch Technology Changes Everything
Traditional combination units require manual switching between maintaining your vehicle battery and charging the jump starter. The Auto-Switch feature monitors both batteries and alternates charging between them, keeping both at optimal charge levels indefinitely.
What this means for you:
- Connect once during storage—both batteries stay optimally charged automatically
- Your vehicle starts immediately when needed
- If something goes wrong, you still have 1200A of backup power ready
- No manual switching, no forgetting, no dead batteries
LED Status Indicators:
- Red light: Battery low, active charging in progress
- Yellow light: Nearly full, entering absorption phase
- Green light: Fully charged, maintaining optimal float voltage
Universal Battery Chemistry Compatibility:
Compatible with all common battery types—one charger handles everything from vintage motorcycles to modern performance vehicles:
- Standard Flooded Lead-Acid: Traditional automotive batteries
- AGM (Absorbent Glass Mat): High-performance, maintenance-free batteries
- Gel Cell: Sealed batteries used in mobility and marine applications
- Lithium (LiFePO4): Modern lightweight batteries
Built-In Safety Systems:
- Spark-Proof Connections: Even if you touch clamps together, no sparks
- Reverse Polarity Protection: Connect backwards by accident? Unit won't operate or cause damage
- Short Circuit Protection: Internal circuitry protects against shorts
- Overcharge Protection: Microprocessor prevents overcharging
- Temperature Compensation: Adjusts for cold or hot environments automatically
Complete System Includes:
- Battery Tender® Charge N Start 4120 main unit
- Heavy-duty smart clamps with copper-plated jaws
- AC power cord (6 ft) and DC accessory cables
- Premium storage case with built-in LED emergency light
- User manual with safety instructions and warranty registration card
Warranty and Support
Why High-Tech Battery Solutions for Your Battery Maintenance? Family-owned battery specialists since 2010. Located and shipping from Twinsburg, Ohio. We match chargers to your actual application—not just what fits. Premium brands like Battery Tender backed by expertise that other retailers can't provide.
- Warranty Period: 1 year manufacturer's warranty
- Shipping: Free standard shipping on orders $75+
- Support: Technical assistance available for application verification and installation questions