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  • SleepWatt parasitic draw tester
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SleepWatt ™

$119.99
$119.99
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check_circle See your battery drain without a multimeter

check_circle Know if your car drains overnight

check_circle Test with a fuse guarding your circuit

check_circle Tell a normal draw from a problem

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  • Switch off, remove the key, lock the doors, and let the car go to sleep.
  • Clamp red to positive and black to negative, with the spring clip on the post.
  • Loosen the negative terminal clamp, then read the draw on the bottom row.
  • Remove the tool first, then reconnect the negative terminal. Do not start the engine.

  • 1 digital V/A meter with leads and fuse holder
  • 1 red insulated clamp
  • 1 black insulated clamp
  • 1 spring fork clip

Once your item/s is dispatched,
the estimated delivery time is:

- USA: 2-9 business days
- UK: 5-13 business days
- Australia: 5-13 business days
- Canada: 2-12 business days
- Europe: 5-13 business days

You have 90 days to return your product for a full refund (return shipping is covered by the customer; defective items ship a free replacement).

✓ Official Authorized Retailer

This product is not available on Amazon or eBay. You are purchasing directly from the only authorized seller — which means full warranty, verified authenticity, and dedicated customer support. Beware of counterfeit listings on third-party marketplaces.

SleepWatt parasitic draw tester

SleepWatt

 4.8/5
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  • Over 17,000 recommend SleepWatt

Everything in the kit to read your parked-car draw

monitoring

Read voltage and draw in one look

Battery voltage shows on the top row and current on the bottom, three digits each, so one glance gives you both numbers.

back_hand

Grab the posts with an insulated grip

Plastic insulated handles give you a solid hold on each clamp. The red clamp is marked + for positive, the black goes to negative.

SleepWatt
shield

Keep a fuse on the lead as you test

A blade fuse holder sits on the red lead while you test. If the fuse is damaged, swap in one of the same rating.

link

Hold the post hands-free with the clip

The two-prong spring fork clip on the black lead grips the battery post. Every lead and clamp you need comes in the kit.

Frequently Asked Questions

verified +347 experts reviewed it as the best choice in 2026
Q1 Do I need a separate multimeter?
No, you don't need one. The meter has its own LED display with voltage on the top row and current on the bottom, three digits each. Clamp it on, follow the steps, and read your parked car's draw.
Q2 What is a normal parasitic draw reading?
For ordinary vehicles the ideal standby draw is about 20 to 50 mA, though it differs by model. Read it after the car has slept and you can see how your number compares.
Q3 How long should I wait before testing?
It depends on your vehicle, because sleep time differs by model, so be patient. Switch off, remove the key, lock all doors, and give the car computer time to sleep before you read the meter.
Q4 Why does my meter show 0?
The meter starts at 30 mA. If your car's sleep current is below that, it shows 0, which means no leakage. Readings above it show in amps, so 50 mA appears as 0.05 A.
Q5 Will I lose my radio presets?
The test has you loosen the negative terminal, so jot down your radio presets first. Then follow the steps in order, and remove the tool before you reconnect the negative terminal.
Q6 Can I start the engine during the test?
Keep the ignition off with the key out. Starting the engine mid-test can burn out the fuse. Remove the tool first, then reconnect the negative terminal when you are done.
Q7 What if the fuse blows?
The red lead has an inline blade fuse holder. If the fuse is damaged, swap in one of the same rating. Keep the engine off during the test, since starting it can burn out the fuse.
Q8 Does it plug into the fuse box?
It works right at the battery with clamps and a clip, and shows your total draw. It doesn't name the circuit, so think of it as your first check on how much your parked car pulls.
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