The Battery Tender® Charge N Start 1120 is the smart battery charger, maintainer, and portable jump starter that prevents the dead battery and handles it when prevention wasn't enough — with 1200 Amps of lithium jump starting power for gas engines up to 6.0L and diesel engines up to 4.0L. More jump starting power than the CNS 1100, same 1 Amp ISM smart charging, and the same auto-switching internal lithium pack that stays fully charged and always ready.

Two Devices. One Unit. Complete Battery Coverage.

As a 1 Amp ISM smart battery charger and maintainer, it keeps the vehicle battery at 100% through Battery Tender® ISM technology. As a 1200 Amp portable lithium jump starter, the internal pack delivers full-size vehicle starting power for gas engines up to 6.0L and diesel engines up to 4.0L — without jumper cables or a second vehicle.

How to Jump Start a Car Without Jumper Cables

Jump starting a dead car battery takes under two minutes:

1. Connect the red jump start clamp to the positive (+) terminal on the dead battery
2. Connect the black jump start clamp to a ground point or the negative (−) terminal
3. Spark-proof system confirms connection before any current flows
4. Crank for up to 5 seconds — most vehicles start within 1–3 attempts
5. Disconnect clamps and store

No second vehicle. No jumper cable sequence. 1200 Amps handles full-size trucks and SUVs with gas engines up to 6.0L and diesel engines up to 4.0L.

How to Jump Start a Motorcycle, ATV, or Powersports Vehicle

At 1200 peak Amps, the CNS 1120 is a significantly overpowered motorcycle jump starter — more than enough to start any powersports battery quickly and safely:

1. Access the battery — remove the seat or open the battery compartment as needed
2. Connect the red jump start clamp to the positive (+) terminal
3. Connect the black clamp to a clean ground point on the frame or the negative (−) terminal
4. Crank for no more than 3–5 seconds — powersports batteries are small and recover from a lithium jump pack quickly
5. Once running, disconnect and secure the battery compartment

ATVs, UTVs, side-by-sides, dirt bikes, and personal watercraft with 12V batteries are all compatible with the CNS 1120 jump start function. These vehicles are among the most common seasonal storage scenarios where ISM maintenance charging provides the highest value — keeping the battery at full charge through months of inactivity so the jump start function is rarely needed.

CNS 1120 vs CNS 1100 — Why 1200 Amps

Both units share the 1 Amp ISM smart charger. The CNS 1120 steps up to 1200 Amps — providing additional cranking capacity for full-size trucks, SUVs, larger engines, and cold-weather starts where extra peak Amps make the difference.

Two Separate Clamp Sets — Not Interchangeable

Dedicated charging clamps for ISM maintenance. Dedicated jump start clamps for 1200 Amp cranking. Not interchangeable — engineered for their specific functions.

Internal Lithium Jump Pack — Auto-Switch Keeps It Ready

The Charge N Start 1120 automatically switches between charging the external vehicle battery and topping up the internal jump pack when it detects the internal level has dropped — ensuring 1200 Amps of jump starting power is always available when needed. Both functions stay operational without separate charging sessions or devices.

The Prevention and the Cure

ISM prevents sulfation — the permanent, irreversible cause of most dead batteries in stored vehicles. When unexpected failures occur, 1200 Amps handles the start. One unit covers both outcomes.

Multi-Chemistry Charging: Lead-Acid and Lithium

The 1 Amp smart charger supports both lead-acid and Lithium (LiFePO4) battery chemistries with a manual selector delivering the correct ISM charging profile for each type. Compatible battery size range: 14Ah to 80Ah at 12V. Lead-acid: flooded, AGM, gel cell, sealed MF. Lithium: LiFePO4.

ISM: 4-Stage Smart Charging

• Initialization — Battery health check before charging begins
• Bulk Charge — Full 1 Amp output restores depleted capacity
• Absorption — Current tapers automatically as the battery approaches full charge, preventing overcharge damage
• Float Maintenance — Micro-current delivered 24/7 maintains peak voltage indefinitely without overcharging

Compatible Vehicles

• Passenger cars and trucks up to 6.0L gas / 4.0L diesel
• Motorcycles and touring bikes
• ATVs, UTVs, and powersports vehicles
• Boats and personal watercraft
• RVs and campers
• Any 12V lead-acid or Lithium battery from 14Ah to 80Ah

Why Lithium Jump Starters Outperform Lead-Acid Jump Boxes

Lithium delivers consistent peak Amp output in cold weather when lead-acid units lose capacity most, holds charge for months in storage, and weighs significantly less than equivalent lead-acid jump boxes — staying ready through extended wall-connected maintenance charging without degradation.

Safety Features

• Spark-proof connection on both clamp sets — no current flows until connection is confirmed correct
• Reverse polarity protection on both clamp sets
• Short-circuit protection
• Overcurrent protection
• ETL and CETL certified

1-Year Limited Warranty | DeLand, Florida Since 1965