Cold mornings are hard on car batteries. A portable jump starter lets you get going again on your own: no second car, no cables strung between bumpers, no waiting on roadside help.
What a jump starter is
It's a compact lithium battery pack with built-in clamps. Charge it at home, keep it in your glovebox or trunk, and it's ready when your battery isn't. Many models also work as a power bank for your phone.
How to use one safely
- Turn everything off. Ignition, lights, radio and AC all off.
- Check the jump starter is charged and switched off before connecting.
- Connect the red clamp to the positive (+) battery terminal.
- Connect the black clamp to bare metal on the engine block or chassis, or to the negative (−) terminal if your manual says to.
- Switch the jump starter on and start the car.
- Once it starts, disconnect in reverse order: black first, then red.
- Drive for at least 20–30 minutes so the alternator can recharge the battery.
Always follow the instructions that came with your unit and your vehicle's owner's manual. If the car won't start after a couple of tries, the battery may need replacing.
Tips to keep it ready
- Recharge it every few months, even if you haven't used it.
- In extreme cold, bring it inside overnight so it holds its charge.
- Keep it somewhere you can reach quickly, not buried under gear.
Our picks
Cold Start Jump Starter & Power Bank (20,000mAh, 2000A peak) →
Baseus 1000A Jump Starter & Power Bank (12,000mAh, digital display) →