Professional-grade 12V lithium jump starter: 2000 peak amps, 1000 cranking amps. Starts V8 diesel engines, powers RV slide-outs. Up to 40 jump starts per charge. Under 5 lbs, extreme cold rated.
The PowerMax PMJS 2000 delivers professional-grade power in an ultra-portable package, capable of instantly jump-starting everything from compact cars to heavy-duty trucks with V8 diesel engines. With 2000 peak amps and 1000 cranking amps of reliable lithium power, this jump starter handles even completely dead batteries with ease - no more waiting for AAA or dealing with jumper cables from another vehicle. The advanced lithium-polymer battery technology provides 80% more power than traditional lead-acid jump starters while weighing less than 5 pounds, making it easy to store in your glove box, RV storage compartment, or emergency kit.
Beyond jump-starting, the PMJS 2000 serves as a versatile power source for RV owners and outdoor enthusiasts. Power your RV slide-outs, awnings, and 12V tongue jacks when coach batteries are dead - perfect for emergencies or maintenance. The built-in 5V/2.4A USB port charges smartphones and tablets, while the 12V DC output (15A capacity) powers small compressors, fans, camping gear, and other 12V accessories. An ultra-bright LED work light with three modes (steady, strobe, SOS) provides visibility during nighttime emergencies. The lithium battery holds its charge 10 times longer than lead-acid models and works reliably in extreme temperatures from 0°F to 104°F. With up to 40 jump starts per charge on 4-cylinder engines, built-in safety protections, and a 3-year warranty, this is the reliable emergency power solution you need.
Instantly starts V8 diesel engines - powerful enough for trucks, RVs, boats, SUVs
Up to 40 starts per charge (4-cyl) - long-lasting lithium battery minimizes downtime
Works 0°F to 104°F - reliable winter performance when you need it most
Compact & lightweight - 80% more powerful than bulky lead-acid models
Engine Types Supported: • Gasoline Engines: Up to V8 • Diesel Engines: Up to V8 • Motorcycles, ATVs, Riding Mowers • Boats, PWC (Personal Watercraft) • Commercial Vehicles, Light Trucks Jump Start Capacity: • 2000 Peak Amps (maximum instantaneous power) • 1000 Cranking Amps (sustained starting power) • Up to 40 Jump Starts per charge (4-cylinder engines) • 20-30 Jump Starts for 6-cylinder engines • 10-15 Jump Starts for V8 engines Works With Completely Dead Batteries: Unlike some jump starters that require residual voltage, the PMJS 2000 can start vehicles with totally dead batteries - essential for emergency situations where batteries have been drained for days or weeks.
In The Box: • PMJS 2000 Lithium Jump Starter • Heavy-Duty 6 AWG Jumper Cables (14") • Copper-Coated Battery Clamps • Micro USB Charging Cable • 12V Male Charging Cable (Car Charger) • Female 12V Output Adapter • Owner's Manual & Safety Instructions • Warranty Card Ready to Use: Unit ships partially charged but must be fully charged before first use. Charge every 30 days to maintain battery health and warranty coverage.
Beyond Jump-Starting: RV Applications: • Power slide-outs when batteries are dead • Operate electric awnings • Run 12V tongue jacks for maintenance • Emergency power for lights and fans USB Power Bank (5V/2.4A): • Charge smartphones, tablets • Power dash cams, GPS units • Run small USB fans • Emergency communication devices 12V DC Output (15A/180W): • Portable tire inflators • 12V camping fans • LED work lights • Small refrigerators • 12V vacuum cleaners Calculate device power: Amps × 12V = Watts Example: 7A device = 84W (well within 180W capacity)
Battery Safety Warnings: LITHIUM BATTERIES STORE LARGE AMOUNTS OF ENERGY: • Never open, puncture, or incinerate • Do not drop or expose to impacts • Keep dry at all times • Do not short-circuit terminals • Never expose to temperatures above 265°F Charging Requirements: • MUST charge completely before first use • Recharge every 30 days minimum • Failure to recharge regularly voids warranty • Charge on non-flammable surface • Never charge a frozen battery Jump-Starting Safety: • Wear ANSI-approved safety goggles • Work in well-ventilated area • Never touch positive and negative clamps together • Connect red to positive (+), black to negative (-) • Remove jewelry before working near battery • Do NOT use on non-rechargeable batteries Consult physician before use if you have a pacemaker.
Lithium-polymer technology provides dramatically superior performance: more power, lighter weight, longer charge retention, and better cold-weather reliability compared to outdated lead-acid jump starters.
RV-Specific Applications: Emergency Slide-Out Power: When your coach batteries die unexpectedly, the PMJS 2000 can power your electric slide-outs so you can retract them for travel or service. Simply connect to the slide-out motor's 12V terminals and operate normally. This is invaluable when you need to close slides but batteries won't hold a charge. Awning Operation: Electric awnings draw substantial current that dead batteries can't provide. The PMJS 2000's 15A DC output handles most RV awnings easily, allowing you to retract them in emergencies or extend them when boondocking with depleted batteries. Tongue Jack Power: 12V electric tongue jacks require considerable power. Connect the PMJS 2000 when your batteries are too weak to raise or lower the jack for hitching/unhitching. Jump-Starting RV Engines: Powerful enough for RV chassis engines including V8 gas and diesel. The 14" cables may not reach from outside to engine bay on large Class A motorhomes - in those cases, connect directly to chassis battery under hood. Boondocking Backup: Keep charged for emergency power when off-grid. Can recharge via solar through USB port. Weighs under 5 lbs - easy to store in RV storage compartments.
Manufacturer: PowerMax Converters Address: 5107 Lena Road, Suite #108, Bradenton, FL 34211 Product Documentation: Owner's Manual: PMJS 2000 Manual (PDF) Spec Sheet: PMJS Spec Sheet (PDF) Warranty Coverage: 3-Year Limited Warranty Covers defects in materials and workmanship under normal use. Battery must be recharged every 30 days to maintain warranty coverage. Register your product at PowerMaxConverters.com Important: Charge unit completely before first use and recharge every 30 days minimum to prevent battery degradation and maintain warranty validity.
A: The number of jump starts per charge depends on your vehicle's engine size and the battery's state of discharge. For 4-cylinder engines, you can expect up to 40 jump starts per charge - this is ideal for small cars, compact SUVs, and motorcycles. For 6-cylinder engines (mid-size sedans, most SUVs), expect 20-30 jump starts. For V8 engines (trucks, large SUVs, RVs), expect 10-15 jump starts. These numbers assume the vehicle's battery is moderately discharged. If you're jump-starting a completely dead battery that's been sitting for months, each jump start consumes more power, so you'll get fewer total starts. The lithium-polymer battery in the PMJS 2000 provides dramatically more starts per charge compared to lead-acid jump starters, which typically manage only 5-10 starts total. For most users, one full charge of the PMJS 2000 lasts months or even a full year of occasional use. Remember to recharge every 30 days even if unused to maintain battery health and warranty coverage.
A: Yes, the PMJS 2000 is specifically designed for cold-weather performance and operates reliably down to 0°F (-18°C). This is one of the major advantages of lithium-polymer technology over lead-acid jump starters. Traditional lead-acid batteries lose 50% or more of their capacity when temperatures drop below freezing, making them nearly useless when you need them most during winter emergencies. The PMJS 2000's lithium chemistry maintains consistent performance in cold weather - while you'll see some capacity reduction at 0°F compared to room temperature, it still delivers sufficient power to crank cold engines. That said, extremely cold temperatures affect ALL batteries (including your vehicle's battery), so winter jump-starting may require a bit more time. Keep the PMJS 2000 inside your vehicle rather than in an unheated trunk or truck bed, as starting from a warmer state improves performance. If you live in areas with extreme cold (below -20°F), consider bringing the unit inside overnight so it starts warmer. The upper temperature limit is 104°F (40°C), so it also handles hot summer conditions in vehicles parked in the sun.
A: You can store the PMJS 2000 in your vehicle year-round within its operating temperature range of 0°F to 104°F. However, there are some important considerations for optimal battery life. In summer, vehicles parked in direct sunlight can exceed 150°F inside - well above the safe operating limit. If you live in a hot climate, either park in shade, store the unit in a cooler area of the vehicle (under seats rather than dashboard), or bring it inside during heat waves. In winter, below-freezing temperatures won't damage the unit but may reduce its immediate starting power until it warms up. The more critical issue is the recharging schedule: you MUST recharge the PMJS 2000 every 30 days to maintain battery health and warranty coverage. Lithium batteries have very low self-discharge rates (they hold charge 10x longer than lead-acid), but they still need periodic recharging. Set a monthly reminder on your phone to bring the unit inside and charge it overnight via the included Micro USB cable (any USB charger works) or the 12V car adapter. This 30-day recharge requirement is standard for lithium jump starters and ensures the battery maintains its capacity over the unit's 3-5 year lifespan.
A: Jump-starting with the PMJS 2000 is straightforward but requires following proper safety procedures. First, ensure the unit is charged (check the LED battery level indicator - at least 50% charge recommended). Turn off your vehicle and all accessories. Connect the RED clamp to the POSITIVE (+) terminal of your vehicle's battery - this is usually marked with a red cover or "+" symbol. Then connect the BLACK clamp to the NEGATIVE (-) terminal or to a metal ground point on the engine block (grounding to the engine block is safer if you're uncertain about battery condition). Once connected, press the POWER button on the PMJS 2000 - the unit will perform a safety check and illuminate the Power LED when ready. Attempt to start your vehicle - keep cranking attempts under 5 seconds, and wait 30 seconds between attempts to avoid overheating your starter motor. Once the engine starts, let it run for 30-60 seconds before disconnecting. Remove the BLACK clamp first, then the RED clamp. Important: If the unit displays an error LED (reverse polarity, short circuit), disconnect immediately and verify proper connection. The manual override button can force starting when safety warnings appear, but use this ONLY if you're certain connections are correct - improper use can damage the unit or vehicle electrical system.
A: Absolutely - this is one of the PMJS 2000's most valuable RV applications. When your coach batteries are completely dead (common after long storage or parasitic drain), you can't operate electric slide-outs, awnings, or tongue jacks - which is a major problem if you need to close slides for travel or service. The PMJS 2000's 12V DC output provides 15 amps (180 watts) of power, sufficient for most RV slide-out motors and electric awnings. To use it, locate the 12V connections for your slide-out motor (usually accessible near the motor itself or at the battery compartment), and connect the PMJS 2000 using the included 12V adapter cables. Turn on the unit and operate your slide-out or awning normally via the RV's controls. Most slide-outs and awnings complete their operation in 15-30 seconds, consuming minimal power from the jump starter. For tongue jacks, the process is similar. One important limitation: the 14" jumper cables attached to the unit are meant for jump-starting, not for powering RV accessories - use the separate 12V DC output port with appropriate adapters. This feature is genuinely lifesaving when you're stuck with dead coach batteries and need to retract slides for travel or emergency departure.
A: Peak amps and cranking amps measure different aspects of a jump starter's performance. Peak amps (2000A for the PMJS 2000) represents the absolute maximum instantaneous current the unit can deliver for a fraction of a second - this is the brief surge needed to overcome a dead battery's internal resistance and initially spin the starter motor. Think of it like the maximum strength a weightlifter can exert for one rep. Cranking amps (1000A for the PMJS 2000), also called CCA (Cold Cranking Amps), measures sustained current delivery over 30 seconds at 0°F - this represents the unit's ability to keep cranking if the engine doesn't start immediately. This is like the weightlifter's sustained strength over multiple reps. For jump-starting, you need BOTH: high peak amps to overcome initial resistance, and sufficient cranking amps to keep the starter motor spinning if the first attempt fails. The PMJS 2000's 2000A peak rating means it can jump-start V8 diesel engines (which require massive initial surge), while the 1000A cranking rating means it can sustain that effort through multiple cranking attempts. Compare this to cheap jump starters claiming "20,000 peak amps" - these are often misleading marketing numbers with inadequate cranking amp ratings, meaning they might deliver one weak attempt but can't sustain cranking. The PMJS 2000's balanced 2000A peak / 1000A cranking specifications indicate genuine professional-grade performance.