Slickdeals is community-supported.  We may get paid by brands for deals, including promoted items.
Heads up, this deal has expired. Want to create a deal alert for this item?
expirediconian | Staff posted Jul 11, 2025 04:25 PM
expirediconian | Staff posted Jul 11, 2025 04:25 PM

Prime: 20,000mAh BooKoo A9 2000A Car Battery Jumper w/ QC 3.0 & 18W PD

+ Free Shipping

$22

$70

68% off
Amazon
86 Comments 76,806 Views
Visit Amazon
Good Deal
Save
Share
Deal Details
Update: This very popular front-page deal is available again.

BOOKOO via Amazon has for Prime Members: 20,000mAh BooKoo A9 2000A Car Battery Jumper w/ QC 3.0 + 18W Power Delivery for $36.79 - $14.72 w/ promo code OEGAZA8E at checkout = $22.07. Shipping is free.

Thanks to Deal Editor iconian for sharing this deal.

Product Details:
  • 74Wh portable lithium car battery jump starter can safely jump start a low volt,drain or dead car battery in seconds with this 2000A car starter, rated for gasoline engines up to 8.0L and diesel engines up to 6.5L.
  • 3 LED lights modes: Flash Light, Strobe Light, and SOS Light
  • 20000 mAh large capacity battery backup can start dead battery over 30 times
  • IP66 Water Resistant
  • USB-C Input

Editor's Notes

Written by SubZero5 | Staff
  • About this Deal:
    • Limited time deal, while supplies last.
  • About this Product:
    • Rated 4.5 out of 5 stars at Amazon based on over 3,830 customer reviews.
  • About this Store:
  • Additional Notes:
    • Please see the original post for additional details & give the WIKI and additional forum comments a read for helpful discussion.

Original Post

Written by iconian | Staff
Community Notes
About the Poster
Deal Details
Community Notes
About the Poster
Update: This very popular front-page deal is available again.

BOOKOO via Amazon has for Prime Members: 20,000mAh BooKoo A9 2000A Car Battery Jumper w/ QC 3.0 + 18W Power Delivery for $36.79 - $14.72 w/ promo code OEGAZA8E at checkout = $22.07. Shipping is free.

Thanks to Deal Editor iconian for sharing this deal.

Product Details:
  • 74Wh portable lithium car battery jump starter can safely jump start a low volt,drain or dead car battery in seconds with this 2000A car starter, rated for gasoline engines up to 8.0L and diesel engines up to 6.5L.
  • 3 LED lights modes: Flash Light, Strobe Light, and SOS Light
  • 20000 mAh large capacity battery backup can start dead battery over 30 times
  • IP66 Water Resistant
  • USB-C Input

Editor's Notes

Written by SubZero5 | Staff
  • About this Deal:
    • Limited time deal, while supplies last.
  • About this Product:
    • Rated 4.5 out of 5 stars at Amazon based on over 3,830 customer reviews.
  • About this Store:
  • Additional Notes:
    • Please see the original post for additional details & give the WIKI and additional forum comments a read for helpful discussion.

Original Post

Written by iconian | Staff

Community Voting

Deal Score
+112
Good Deal
Visit Amazon

Price Intelligence

Model: Jump Starter 12V 2000A for Car/Boat/Lawnmower(8.0L Gas/6.5L Diesel Engine) Portable Booster Battery Pack with Jump Cables/Wall Charger/USB Cable

Deal History 

Sale Price
Slickdeal
  • $NaN
  • Today

Current Prices

Sort: Lowest to Highest | Last Updated 8/1/2025, 01:59 AM
Sold By Sale Price
Amazon$69.99

Leave a Comment

Unregistered (You)

Top Comments

Oil_Burner
1028 Posts
70 Reputation
Don't rely on inflated mAh numbers. Evaluate your jump starter based on its Wh rating and real-world performance. Proper testing will reveal whether your device can actually deliver when your engine needs it most. Many jump starters advertise large capacities like 26,800mAh, but that number alone doesn't mean much. Without the corresponding Watt-hour (Wh) rating, it's just a marketing number. What truly matters is the usable energy output.

Based on extensive testing, most of these devices only deliver about one-third of their advertised capacity. In reality, you're likely getting around 12,000 to 16,000mAh of usable energy.

High amp ratings like "1500A peak" are common, but they don't tell the full story unless:
- The boost circuit is well-designed,
- The battery cells can sustain high discharge current,
- The wiring and connectors are thick and efficient.

My 3.0L German diesel engine requires approximately 800 amps for 3 seconds during startup.

Power Calculation: 12V × 800A × (3 sec / 3600 sec) ≈ 8 Wh

So, a single crank uses about 8 watt-hours. If your jump starter is rated at 30Wh, you'll get maybe 2–3 cranks total, especially after accounting for energy lost during voltage conversion.

- Cheaper units lose 20–25% energy in the process.
- High-quality brands like NOCO typically lose 15–20%.

How to Accurately Test a Jump Starter:
1. Charge the jump starter to 100%. Use a USB power meter to ensure it's no longer drawing current.
2. Discharge it completely and record the watt-hours (Discharge Wh).
3. Calculate actual capacity in mAh: Real Capacity (mAh) = Discharge Wh ÷ 3.7V
4. Charge the device back to 100% and record the input watt-hours (Input Wh).
5. Calculate energy loss: Loss Wh = (Input Wh - Discharge Wh)
6. Calculate efficiency: Efficiency % = 100 - (Loss Wh ÷ Input Wh × 100)
Cpt_Nemo
297 Posts
66 Reputation
it looks like this listing used to be for some sort of a portable screen, so the rating is probably inaccurate.
ultratumba
5492 Posts
720 Reputation
Mercy BooKoo!

85 Comments

Sign up for a Slickdeals account to remove this ad.

Jul 11, 2025 07:19 PM
5 Posts
Joined Dec 2014
Jul 11, 2025 07:19 PM
kgnetJul 11, 2025 07:19 PM
5 Posts
Promo code worked, Thanks grabed one
Last edited by kgnet July 11, 2025 at 12:22 PM.
3
Jul 11, 2025 07:23 PM
5 Posts
Joined Dec 2014
Jul 11, 2025 07:23 PM
kgnetJul 11, 2025 07:23 PM
5 Posts
Please ignore my above comment, I tried again. Promocode worked. Thanks I grabbed one.
3
Jul 11, 2025 08:33 PM
245 Posts
Joined Dec 2008
Jul 11, 2025 08:33 PM
moosaliniJul 11, 2025 08:33 PM
245 Posts
This one or the other SD item: https://www.amazon.com/dp/B09VXJBFKY
Last edited by Dashey10 July 11, 2025 at 01:34 PM.
Jul 11, 2025 08:33 PM
297 Posts
Joined May 2015
Jul 11, 2025 08:33 PM
Cpt_NemoJul 11, 2025 08:33 PM
297 Posts

Our community has rated this post as helpful. If you agree, why not thank Cpt_Nemo

it looks like this listing used to be for some sort of a portable screen, so the rating is probably inaccurate.
3
Jul 11, 2025 08:57 PM
5,492 Posts
Joined Dec 2009
Jul 11, 2025 08:57 PM
ultratumbaJul 11, 2025 08:57 PM
5,492 Posts
Mercy BooKoo!
20
1
Jul 12, 2025 12:46 AM
4,140 Posts
Joined Aug 2012
Jul 12, 2025 12:46 AM
HyraxJul 12, 2025 12:46 AM
4,140 Posts
If this had ac outlet id bite so hard.
4
Jul 12, 2025 12:54 AM
341 Posts
Joined Sep 2015
Jul 12, 2025 12:54 AM
HopP61633Jul 12, 2025 12:54 AM
341 Posts
Quote from moosalini :
This one or the other SD item: https://www.amazon.com/dp/B09VXJBFKY
https://www.amazon.com/dp/B0BZP6H...title&th=1
Same OP. Are they the same?

Sign up for a Slickdeals account to remove this ad.

Jul 12, 2025 01:05 AM
44 Posts
Joined Mar 2017
Jul 12, 2025 01:05 AM
wildfrustrationJul 12, 2025 01:05 AM
44 Posts
Quote from Hyrax :
If this had ac outlet id bite so hard.
The outlet?
6
Jul 12, 2025 05:53 AM
2,886 Posts
Joined Aug 2006
Jul 12, 2025 05:53 AM
whatgooddealJul 12, 2025 05:53 AM
2,886 Posts
USB-C is input only.
1
Jul 12, 2025 05:54 AM
2,886 Posts
Joined Aug 2006
Jul 12, 2025 05:54 AM
whatgooddealJul 12, 2025 05:54 AM
2,886 Posts
Quote from Hyrax :
If this had ac outlet id bite so hard.
one review claim the AC output is 113V. not sure why would they say that
Pro
Jul 12, 2025 11:09 AM
3,541 Posts
Joined Sep 2011
Jul 12, 2025 11:09 AM
JESSE_VENTURA
Pro
Jul 12, 2025 11:09 AM
3,541 Posts
Where is my BooKoo?
Jul 12, 2025 12:05 PM
359 Posts
Joined May 2011
Jul 12, 2025 12:05 PM
DealBoi4LifeJul 12, 2025 12:05 PM
359 Posts
Quote from HopP61633 :
https://www.amazon.com/dp/B0BZP6H...title&th=1
Same OP. Are they the same?
Wondering the same - is the other worth the extra money? I realistically just need 1 jumps-worth in an emergency. I don't own anything bigger than a midsize SUV.
Pro
Jul 12, 2025 12:12 PM
1,961 Posts
Joined Oct 2006
Jul 12, 2025 12:12 PM
samgotit
Pro
Jul 12, 2025 12:12 PM
1,961 Posts
Here's another one for $22.19 after 40% code redeem:

Scatach 011 3000A Car Battery Jump Starter,12V Jump Starter Battery Pack (up to 9.0L Gasoline and 7.0L Diesel Engine), Portable Jump Box with 3 Modes Flashlight and Jumper Cable
https://www.amazon.com/dp/B0CGCRH...title&th=1
Jul 12, 2025 01:56 PM
128 Posts
Joined Jan 2009
Jul 12, 2025 01:56 PM
darlington1Jul 12, 2025 01:56 PM
128 Posts
Key factor is do they have a boost button

Sign up for a Slickdeals account to remove this ad.

Jul 12, 2025 02:30 PM
93 Posts
Joined Aug 2015
Jul 12, 2025 02:30 PM
egadgetboyJul 12, 2025 02:30 PM
93 Posts

Our community has rated this post as helpful. If you agree, why not thank egadgetboy

Bookoo - a name to know and trust Ha ha
1
6

Leave a Comment

Unregistered (You)

Popular Deals

View All

Trending Deals

View All