
XS Power SB500-51 500F 12V SuperBank Ultracapacitor
Many in-stock orders ship within 1-2 business days, but timing varies by item. Custom, built-to-order, oversized, special-order and supplier-direct products may need extra processing time. Free shipping applies to qualifying orders over $99 in the contiguous US. Approved returns may be subject to a restocking fee.
Most products are covered by the manufacturer's warranty against defects. Damage from over-powering or improper installation isn't covered — we'll help coordinate any valid claim.
Tell us your vehicle, subwoofers and electrical setup and our team will help you match the right gear. Reach out before you buy.
The XS Power SB500-51 12V SuperBank brings 500 farads of genuine ultracapacitor performance to the compact Group 51 form factor, making it a natural choice for import builds, tight underhood installs, and any platform that runs a standard Group 51 battery. Its role is that of a dedicated voltage stabilizer and transient buffer: when your amplifiers call for a burst of current that the main battery cannot supply fast enough, the SB500-51 steps in and fills that demand without hesitation.
Competing at SPL events or simply trying to get the most out of a daily-driven high-wattage audio system, the XS Power SB500-51 delivers real, measurable improvements in voltage stability and low-frequency punch. It is a far more effective solution than the single-farad power cap designs of years past, offering hundreds of times more capacitance in a battery-shaped package that installs cleanly and integrates with your existing 12V system without added complexity.
Specifications
| Type | 12-Volt SuperBank Ultracapacitor |
| Group Size | Group 51 |
| Max Power | 4,000 Watts |
| Voltage Range | 12.0 – 16.2 |
| Capacitance | 500 Farads |
| Weight | 11 lbs. |
| Terminal Hardware | M6 Terminal Hardware Included |
Authorized XS Power dealer at JS Ultimate Sounds. Free shipping on orders $99+.
PROP 65 WARNING: This product can expose you to chemicals including lead and lead compounds, which are known to the State of California to cause cancer or birth defects or other reproductive harm. Wash hands after handling.
For more information, visit www.P65Warnings.ca.gov


