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Non-returnable due to Hazmat safety reasons
Non-returnable due to Hazmat safety reasons
This item is non-returnable due to its composition that makes it regulated for transportation, but if the item arrives damaged or defective, you may request a refund or replacement.
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Non-returnable due to Hazmat safety reasons
This item is non-returnable due to its composition that makes it regulated for transportation, but if the item arrives damaged or defective, you may request a refund or replacement.
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Gravity 800 AMP CAR Battery Capacitor GR-800BC

3.8 3.8 out of 5 stars 78 ratings
$149.02
Non-returnable due to Hazmat safety reasons
This item is non-returnable due to its composition that makes it regulated for transportation, but if the item arrives damaged or defective, you may request a refund or replacement.
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Purchase options and add-ons

Capacitance 800 Microfarad
Brand Gravity
Shape Round
Manufacturer Gravity
UPC 700987502763

About this item

  • Brand: Gravity, Manufacturer Part Number: GR-600BC
  • Manufacturer: Gravity
  • Ean: 0700987502763
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Gravity 800 AMP CAR Battery Capacitor GR-800BC
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Customer reviews

3.8 out of 5 stars
3.8 out of 5
78 global ratings
Not what it seems at all
1 Star
Not what it seems at all
This "Battery Capacitor" is all cheap, unlabeled electrolytic (I assume) caps with heavy cables under the cover going from the three caps into a large potted space. When the cables are disconnected from the caps, I found the cables to be an open circuit. Applying voltage source to the disconnected cables and then removing the voltage source results in zero volts - not exactly a battery! This product is a fraud, and an expensive one at that! Real specs weren't even provided until I got the product and found a (sort of) spec sheet that lists the ESR as 10 MOhms! (That's ten million ohms, not ten milliohms. It might be true!)
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Top reviews from the United States

Tim A
5.0 out of 5 stars Works great, no more flashing lights
Reviewed in the United States on May 13, 2022
Verified Purchase
I have a 6000 w rms amp, a 3000w rms amp, and a 800w rms amp in my truck, I have 4 agm just for audio plus the battery under my hood, I have 4 runs of 1/0 ofc wire carrying the power from a 350 amp mechman. When I turned up the bass I would have dimming lights and would my voltage would dip to the low 12s. I was a bit skeptical of this capacitors ability but it actually smoothed out my voltage fluctuations and keeps my voltage above 13 volts when I turn up the volume. I only have 2 complaints, 1) the terminals are very fragile so be careful
2) the blue flashing lights on top of the capacitor are pretty unnecessary, I covered mine with a mix of epoxy and black spray paint.
7 people found this helpful
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mike dilsaver
1.0 out of 5 stars NOT FOR USE ON MAIN BATTERY
Reviewed in the United States on November 11, 2023
Verified Purchase
THEY SAY IT IS TO BE ON THE AUTO TO HELP THE MAIN BATTERY TO MAKE IT LAST LONGER BUT IT DID NOT EVEN START UP. LIKE TO SEND IT OUT THE WINDOW OR SEND IT FAR AWAY. NOT USING IT FOR RADIO AT ALL USING SOLAR PANEL TO SEE IF KEEP MY ONE BATTERY LIFE FROM GOING DOWN WHEN THE SUN DO NOT SHINE. IT IS FOR RADIO WITH AMP PLUS WHEN IN CAR IT WILL WORK WITH ALTERNATOR. FALSE AD AND IT NOT AMPS BUT FARAD. DON'T BUY FOR CAR USE THE 12 X 12 CAPACITORS FOR YOU SOLAR IT GIVES YOU ALL 12v AND IT IS A BETTER ASSIST FOR YOUR WIND AND SOLAR PANALS.
One person found this helpful
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Billyboy
5.0 out of 5 stars Running 2 sundown 1500D just fine
Reviewed in the United States on December 3, 2022
Verified Purchase
2 sundown audio 1500D anniversary edition amps and keeping up!
4 people found this helpful
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Tierney Williams
5.0 out of 5 stars Great
Reviewed in the United States on August 12, 2020
Verified Purchase
This product is very durable holds great back up power have it on 2 Comp 12s and 15,000 Watt system
18 people found this helpful
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nice girl
5.0 out of 5 stars Get big speakers
Reviewed in the United States on March 11, 2020
Verified Purchase
Gives the power to kick the bass
8 people found this helpful
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Madi
4.0 out of 5 stars Not a battery!!!!!!!
Reviewed in the United States on July 7, 2017
I see people are very confused about this item. The description is somewhat misleading. This is not a battery it is a giant capacitor. The description car battery capacitor is because you need a car battery to attach this capacitor on to.
No it won't start your car or truck!!! It is just a surge power supply mostly used in audio equipment
58 people found this helpful
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Techno Dan
1.0 out of 5 stars Not what it seems at all
Reviewed in the United States on November 3, 2023
Verified Purchase
This "Battery Capacitor" is all cheap, unlabeled electrolytic (I assume) caps with heavy cables under the cover going from the three caps into a large potted space. When the cables are disconnected from the caps, I found the cables to be an open circuit. Applying voltage source to the disconnected cables and then removing the voltage source results in zero volts - not exactly a battery! This product is a fraud, and an expensive one at that! Real specs weren't even provided until I got the product and found a (sort of) spec sheet that lists the ESR as 10 MOhms! (That's ten million ohms, not ten milliohms. It might be true!)
Customer image
Techno Dan
1.0 out of 5 stars Not what it seems at all
Reviewed in the United States on November 3, 2023
This "Battery Capacitor" is all cheap, unlabeled electrolytic (I assume) caps with heavy cables under the cover going from the three caps into a large potted space. When the cables are disconnected from the caps, I found the cables to be an open circuit. Applying voltage source to the disconnected cables and then removing the voltage source results in zero volts - not exactly a battery! This product is a fraud, and an expensive one at that! Real specs weren't even provided until I got the product and found a (sort of) spec sheet that lists the ESR as 10 MOhms! (That's ten million ohms, not ten milliohms. It might be true!)
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One person found this helpful
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athelstan mayers
3.0 out of 5 stars the was good good
Reviewed in the United States on November 13, 2021
Verified Purchase
i like it .i use then as a back up
2 people found this helpful
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