{"product_id":"charge-n-start-4120-4-amp-battery-charger-1200-amp-jump-starter","title":"Charge N Start 4120 — 4 Amp Battery Charger \u0026 1200 Amp Jump Starter","description":"\u003cp\u003eThe most capable unit in the Charge N Start lineup. The Battery Tender® Charge N Start 4120 combines a 4 Amp ISM smart battery charger with 1200 Amps of portable lithium jump starting power — four times the charging output of the CNS 1100 and 1120, same 1200 Amp jump starting power as the CNS 1120. Faster battery recovery for larger vehicles. Maximum jump starting power. The complete battery charger and jump starter solution in one portable unit.\u003c\/p\u003e\u003ch3\u003eTwo Devices. Maximum Output. One Unit.\u003c\/h3\u003e\u003cp\u003eAs a \u003cstrong\u003e4 Amp ISM smart battery charger and maintainer\u003c\/strong\u003e, it recovers and maintains larger automotive batteries significantly faster than 1 Amp alternatives. As a \u003cstrong\u003e1200 Amp portable lithium jump starter\u003c\/strong\u003e, it starts full-size vehicles with gas engines up to 6.0L and diesel engines up to 4.0L without jumper cables or a second vehicle.\u003c\/p\u003e\u003ch3\u003eHow to Jump Start a Car — 1200 Amps Without Jumper Cables\u003c\/h3\u003e\u003cp\u003eJump starting a dead car battery with the CNS 4120:\u003c\/p\u003e\u003col\u003e\n\u003cli\u003eConnect the red jump start clamp to the positive (+) terminal on the dead battery\u003c\/li\u003e\n\u003cli\u003eConnect the black jump start clamp to a ground point or the negative (−) terminal\u003c\/li\u003e\n\u003cli\u003eSpark-proof technology confirms connection — reverse polarity protection prevents damage from incorrect connections\u003c\/li\u003e\n\u003cli\u003eCrank for up to 5 seconds per attempt with 30 seconds between attempts\u003c\/li\u003e\n\u003cli\u003eOnce running, disconnect and store\u003c\/li\u003e\n\u003c\/ol\u003e\u003cp\u003eNo second vehicle. No cable management. 1200 Amps handles the full range of passenger cars, trucks, and SUVs with gas engines up to 6.0L and diesel engines up to 4.0L.\u003c\/p\u003e\u003ch3\u003eHow to Jump Start a Motorcycle, ATV, or Powersports Vehicle\u003c\/h3\u003e\u003cp\u003eThe CNS 4120's 1200 Amp lithium jump pack is among the most powerful portable motorcycle and powersports jump starters available — more than sufficient for any 12V powersports battery:\u003c\/p\u003e\u003col\u003e\n\u003cli\u003eAccess the battery — remove the seat or open the battery compartment\u003c\/li\u003e\n\u003cli\u003eConnect the red jump start clamp to the positive (+) terminal\u003c\/li\u003e\n\u003cli\u003eConnect the black clamp to a clean frame ground point or the negative (−) terminal\u003c\/li\u003e\n\u003cli\u003eCrank for no more than 3–5 seconds — small powersports batteries respond immediately to lithium jump pack power\u003c\/li\u003e\n\u003cli\u003eOnce running, disconnect and secure the compartment\u003c\/li\u003e\n\u003c\/ol\u003e\u003cp\u003eThe CNS 4120's 4 Amp ISM charger is particularly well-suited for powersports applications where the battery is used infrequently and benefits from faster recovery after seasonal storage. Motorcycles, ATVs, UTVs, side-by-sides, personal watercraft, and snowmobiles stored for weeks or months are among the highest-risk dead battery scenarios — ISM maintenance charging at 4 Amps keeps them at full capacity and reduces the need for the jump start function over time.\u003c\/p\u003e\u003ch3\u003eHow to Jump Start a Truck or Large SUV\u003c\/h3\u003e\u003cp\u003eFor full-size trucks, diesel pickups, and large SUVs with high-capacity batteries, the 4 Amp charger recovers depleted batteries more than three times faster than 1 Amp alternatives, and 1200 Amps provides ample cranking power for cold starts and marginally charged batteries:\u003c\/p\u003e\u003col\u003e\n\u003cli\u003eLocate the battery — typically under the hood, occasionally in the truck bed or under the seat\u003c\/li\u003e\n\u003cli\u003eConnect red clamp to positive (+), black clamp to ground or negative (−)\u003c\/li\u003e\n\u003cli\u003eSpark-proof confirmation before current flows\u003c\/li\u003e\n\u003cli\u003eCrank for up to 5 seconds with 30-second intervals between attempts\u003c\/li\u003e\n\u003cli\u003eDisconnect once running\u003c\/li\u003e\n\u003c\/ol\u003e\u003ch3\u003eCNS 4120 vs CNS 1120 — Why 4 Amp Charging Matters\u003c\/h3\u003e\u003cp\u003eBoth units deliver 1200 Amps of jump starting power. The CNS 4120's 4 Amp charger recovers large automotive batteries more than three times faster during bulk charge — meaningful for trucks, SUVs, RVs, and boats where 1 Amp recovery takes significantly longer.\u003c\/p\u003e\u003ch3\u003eTwo Separate Clamp Sets — Not Interchangeable\u003c\/h3\u003e\u003cp\u003eDedicated charging clamps for ISM maintenance. Dedicated jump start clamps for 1200 Amp cranking. Not interchangeable — engineered for their specific functions.\u003c\/p\u003e\u003ch3\u003eInternal Lithium Jump Pack — Auto-Switch Keeps It Ready\u003c\/h3\u003e\u003cp\u003eThe Charge N Start 4120 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.\u003c\/p\u003e\u003ch3\u003eThe Prevention and the Cure — At Full Output\u003c\/h3\u003e\u003cp\u003e4 Amp ISM prevents sulfation across all battery sizes. 1200 Amp jump pack handles unexpected failures. One unit, both outcomes, maximum output.\u003c\/p\u003e\u003ch3\u003eMulti-Chemistry Charging: Lead-Acid and Lithium\u003c\/h3\u003e\u003cp\u003eThe 4 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 100Ah at 12V. Lead-acid: flooded, AGM, gel cell, sealed MF. Lithium: LiFePO4.\u003c\/p\u003e\u003ch3\u003eISM: 4-Stage Smart Charging at 4 Amps\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eInitialization\u003c\/strong\u003e — Battery health check and polarity confirmation before charging begins\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eBulk Charge\u003c\/strong\u003e — Full 4 Amp output restores depleted capacity efficiently\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eAbsorption\u003c\/strong\u003e — Current tapers automatically as the battery approaches full charge, preventing overcharge damage\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFloat Maintenance\u003c\/strong\u003e — Correct maintenance protocol for the selected chemistry delivered 24\/7, indefinitely\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eCompatible Vehicles\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003ePassenger cars and trucks up to 6.0L gas \/ 4.0L diesel\u003c\/li\u003e\n\u003cli\u003eMotorcycles and touring bikes\u003c\/li\u003e\n\u003cli\u003eATVs, UTVs, and off-road vehicles\u003c\/li\u003e\n\u003cli\u003eBoats and marine vessels\u003c\/li\u003e\n\u003cli\u003eRVs and campers\u003c\/li\u003e\n\u003cli\u003eAny 12V lead-acid or Lithium battery from 14Ah to 100Ah\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eWhy Lithium Outperforms Lead-Acid Jump Boxes\u003c\/h3\u003e\u003cp\u003eConsistent peak Amps in cold weather when lead-acid units lose capacity most. Months of charge retention in storage. Fraction of the weight of lead-acid units. Stays ready through continuous wall-connected maintenance charging without degradation.\u003c\/p\u003e\u003ch3\u003eSafety Features\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eSpark-proof connection on both clamp sets\u003c\/strong\u003e — no current flows until connection is confirmed correct\u003c\/li\u003e\n\u003cli\u003e\u003cstrong\u003eReverse polarity protection on both clamp sets\u003c\/strong\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cstrong\u003eShort-circuit protection\u003c\/strong\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cstrong\u003eOvercurrent protection\u003c\/strong\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cstrong\u003eETL and CETL certified\u003c\/strong\u003e\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003e\u003cstrong\u003e1-Year Limited Warranty | DeLand, Florida Since 1965\u003c\/strong\u003e\u003c\/p\u003e","brand":"Battery Tender®","offers":[{"title":"Default Title","offer_id":52241550934290,"sku":"030-7020-WH","price":179.95,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/1929\/4483\/files\/030-7020-WH_wClips.jpg?v=1777901519","url":"https:\/\/hdwerks.net\/products\/charge-n-start-4120-4-amp-battery-charger-1200-amp-jump-starter","provider":"HDwerks ","version":"1.0","type":"link"}