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Gravity

Gravity Gr-1000Bc 1000 Amp Car Battery Capacitor

★★★★★3.3 (36 reviews)

Stabilize amplifier voltage and eliminate headlight dimming with the Gravity 1000 Amp capacitor built for high-demand car audio systems.

$179.99*
✓ In Stock on Amazon.com
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*Price sourced from Amazon.com. Last updated:Jul 14, 2026.Price and availability are subject to change.

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Overview

Car audio amplifiers — especially subwoofer amps drawing hundreds of watts on bass transients — demand more instantaneous current than most stock vehicle electrical systems can cleanly deliver. The result is headlight dimming, amplifier clipping, and voltage sag that compresses dynamic range in your audio. The Gravity GR-1000BC is a 1000-amp capacitor designed to bridge that gap: it charges up between transients and releases stored current instantly when the amp demands it, smoothing out the voltage spikes and dips that degrade both sound quality and electrical system health. It's a legitimate tool for mid-to-high power installs running 500W RMS and up.

Constructed with an aluminum housing and rated at 12V maximum, the GR-1000BC fits the standard format for inline capacitor installs. The round profile suits compact mounting locations, and the aluminum body dissipates heat adequately in typical enclosed installs. That said, installation requires proper pre-charging procedure — wiring it directly to a battery without a charge resistor in series will cause a dangerous current inrush. Plan your wiring layout carefully: the capacitor performs best mounted within inches of the amplifier's power terminal with short, heavy-gauge leads. For systems with persistent voltage issues at sustained power, pairing this with a high-output alternator or secondary battery is the more complete solution.

Specifications

Capacity
1000 Amp
Type
Car Battery Capacitor

Pros & Cons

👍 Pros

  • The 1000-amp burst rating makes this capacitor suitable for high-power amplifier setups where stock wiring struggles with transient current demand.
  • Aluminum construction keeps weight reasonable and provides adequate thermal dissipation in an under-seat or trunk install.
  • Round form factor and compact footprint work in tight mounting locations where a rectangular capacitor bank won't fit.
  • Addresses voltage sag on transient bass hits without requiring a full electrical system overhaul for moderate setups.

👎 Cons

  • A capacitor alone does not fix a fundamentally underpowered charging system — if the alternator can't keep up with sustained demand, this is only a partial solution.
  • The listing does not confirm included mounting hardware or a built-in charge indicator, which are standard on higher-end capacitors and are useful for safe installation.
  • No documentation of included instructions means first-time installers will need to research proper pre-charging and wiring procedures independently.
  • At only 12V maximum operating voltage, this is strictly a standard 12V automotive application — not suitable for modified or high-voltage systems.

Frequently Asked Questions

It can help, but it depends on how much your electrical system is being taxed. The capacitor handles instantaneous current demand from amplifiers, reducing the momentary voltage sag that causes dimming. For heavily underpowered charging systems, a higher-output alternator is the proper fix — the capacitor is a supplement, not a replacement for inadequate charging capacity.
The 1000-amp rating is the burst current capacity of the capacitor, not a continuous amp rating. As a general rule of thumb in car audio, one farad of capacitance per 1,000 watts RMS of amplifier power is the common guideline. This capacitor is targeted at mid-to-high power systems in that range.
The product listing does not specify included hardware. Many aftermarket capacitors ship with minimal or no documentation. Plan to source your own power distribution hardware and refer to a wiring diagram from a car audio resource for proper installation.
Yes. Connecting an uncharged capacitor directly to your battery will cause a dangerous current spike. You must pre-charge it through a resistor (typically a test light bulb wired in series) before making the final connection. Skipping this step can damage your electrical system or the capacitor itself.
The capacitor should be mounted as close to the amplifier as possible, with short, heavy-gauge runs. Its job is to supply instantaneous current to the amp, so proximity matters — a long run between the capacitor and the amp reduces its effectiveness.

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