Backup power for the bad morning
Cold-Weather Jump Starters
Choose by engine size and winter storage—not the biggest peak-amp number on the box. A pack that lives discharged at -30°C is far less useful than a correctly sized one you maintain.
Small pack
Cars and small gas engines
Portable, easier to keep charged
Mid-size pack
SUVs, pickups, light diesels
The all-round driveway choice
Large pack
Big diesels and equipment
More reserve, more cost and weight
The winter storage rule
Recharge the pack on a schedule and after every use. If it must stay in the vehicle, check its charge more often and respect the listed storage temperature. On the coldest day, warming the pack safely indoors before use can restore useful output.
Look for
- ✓ Engine-size rating for gas and diesel
- ✓ Reverse-polarity and spark protection
- ✓ Clear cold operating limits
- ✓ Replaceable or durable clamps
- ✓ A charge indicator you can read quickly
Do not rely on
- — Peak amps without engine ratings
- — A pack untouched since last winter
- — Damaged or swelling lithium cells
- — Boosting a frozen or leaking battery
- — A small pack for a heavy diesel
Cold-start jump packs to compare
Amazon buying options
NOCO Boost GB40 lithium jump starter, 1000 A
Boosts gas engines up to 6 L and diesels up to 3 L without a second vehicle. Spark-proof, holds a charge for months in the glovebox.
Confirm the exact specification and application in the listing before ordering.
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Amazon buying options
NOCO Boost GBX45 lithium jump starter, 1250 A
The step-up boost pack for full-size trucks — gas engines to 6.5 L, diesels to 4 L. Worth it if a diesel pickup is what sits in your driveway.
Confirm the exact specification and application in the listing before ordering.
Choose your Amazon store
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Quick questions
Do lithium jump starters work at -30°C?
They can, but a cold-soaked lithium pack produces less power. Keep it charged and, when practical, warm the pack indoors before use. Follow its operating-temperature limits.
What size jump starter do I need for a diesel?
Use the manufacturer's engine-size rating, not peak amps alone. Large diesels and dual-battery systems need a substantially larger pack than a four-cylinder car.
Does a jump starter replace a block heater?
No. It supplies emergency cranking current; it does not thin the oil or warm the engine. A block heater prevents the hard start rather than rescuing it.
Prevent the no-start with a battery blanket and the correct engine heater.