The Battery Tender Charge N Start 4120 is the most capable unit in the Charge N Start lineup. It pairs a 4 Amp smart battery charger with a 1200 Amp portable lithium jump starter, so one unit on your garage shelf can keep the bike topped off through the winter, bring a drained truck, boat or RV battery back fast, and jump start just about anything you own.
The 4 Amp charger recovers big batteries more than three times faster than a 1 Amp tender. A depleted car battery that takes 20+ hours on a 1 Amp unit takes about 5 hours on the 4120. That makes it ideal for riders who also have a pickup, a camper, a boat or a side-by-side to keep alive. On a motorcycle, the 4 Amp output is great for bringing a battery back after a long storage season, then the charger steps down to float maintenance once it's full.
While it's plugged in, the Charge N Start automatically switches between maintaining your vehicle's battery and topping off its own internal jump pack, so 1200 amps are always ready when you unplug it and head out.
Key Features
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Two tools in one: a 12V 4 Amp smart battery charger/maintainer and a 1200 Amp portable lithium jump starter.
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4 Amp ISM (Infinite Sequential Monitoring) charging: 4-stage charging (initialization, bulk, absorption, float) that recovers large batteries fast, then holds them at the correct float voltage indefinitely without overcharging.
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Auto-switching: keeps both your vehicle battery and the internal jump pack charged while plugged in.
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1200 peak amps: jump starts gas engines up to 6.0L and diesel engines up to 4.0L, plus any motorcycle, ATV, UTV, snowmobile or personal watercraft.
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Two separate clamp sets: dedicated charging clamps and dedicated jump start clamps, each built for its own job (not interchangeable).
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Selectable chemistry: lead-acid (flooded, AGM, gel, sealed maintenance-free) or lithium (LiFePO4) batteries from 14Ah to 100Ah.
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Over 14 feet of reach: 6 ft AC cord, 6 ft DC output cord and a 2 ft accessory cable.
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Safety built in: spark-proof connections and reverse polarity protection on both clamp sets, plus short-circuit and overcurrent protection and circuitry that blocks your vehicle's battery from back-feeding into the jump pack.
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Zippered carrying case keeps everything together.
Specifications
- Output: 12V @ 4 Amp charging, 12V 1200 Amp jump starting
- Jump start range: gas engines up to 6.0L, diesel up to 4.0L
- Battery size range (charging): 14Ah to 100Ah, 12V
- Battery types: standard flooded or sealed lead-acid, AGM, gel, lithium (LiFePO4)
- Input: 120V AC
- Certifications: cETLUS (UL1236 and UL2743), BC, DOE, FCC, ICES, UN38.3
What's Included
- Charge N Start 4120
- Jump start clamps
- Ring terminal and alligator clip combo charging cable
- Extension cable
- AC input cable
- Zippered carrying case
Great for: motorcycles, ATVs, UTVs, dirt bikes, snowmobiles, boats and personal watercraft, RVs and campers, and cars, trucks and SUVs up to 6.0L gas or 4.0L diesel.
Add-Ons (sold separately): Click to add:
Mostly charging motorcycles? The Charge N Start 1100 and Charge N Start 1120 use a 1 Amp charger sized for powersports batteries.
Warranty
Backed by Battery Tender's 1-year limited warranty against defects in materials and workmanship.
Part Numbers:
Manufacturer: 030-7020-WH
P/N: 56-1321, btn030-7020-WH
