Notify me when this product is back in stock
$129.99
Holiday Deal
· 13% off
was $149.99
Buy Now, Pay Later
As low as
$21.67
/ mo
Learn more
- – 6-month term
- – No impact on credit to apply
- – Instant approval decision
- – Secure and straightforward checkout
Payment plans are offered through our trusted finance partners Klarna, Affirm, Afterpay, Zip, Apple Pay, and Google Pay. No-credit-needed leasing options through Acima may also be available at checkout.
Learn more about financing & leasing here.
Free shipping on this product
30-day returns
Learn more
30-day refund/replacement
To qualify for a full refund, items must be returned in their original, unused condition. If an item is returned in a used, damaged, or materially different state, you may be granted a partial refund.
To initiate a return, please visit our Returns Center.
View our full returns policy here.
Availability:
Unavailable
Recently Viewed
At a glance
- Condition
- New
- Model
- UC-31
- Dimensions
- 13 x 13 x 9.45 in; 38.51 lb
- Material
- Aluminum
- Capacitance
- 375 Farad
- Shape
- Round
- Operating Voltage
- 12 Volts
Description
Ioxus UltraCapacitor is a Smart Power ultracapacitor-based product for vehicles that improves starting reliability, improves vehicle voltage health, improves battery life, and improves sustainability. With a 15-year design life, you will never change your ultracapacitor again.
Specs 8
| Capacitance | 375 Farad |
|---|---|
| Brand | Generic |
| Material | Aluminum |
| Shape | Round |
| Operating Voltage | 12 Volts |
| Product Dimensions | 13 x 13 x 9.45 inches; 38.51 Pounds |
| Item model number | UC-31 |
| Manufacturer | IOXUS |
No specs match.
Frequently asked questions
This product is currently out of stock. Please check back later for shipping info.
Yes, absolutely! You may return this product for a full refund within 30 days of receiving it.
To initiate a return, please visit our Returns Center.
View our full returns policy here.
To initiate a return, please visit our Returns Center.
View our full returns policy here.
- Klarna Financing
- Affirm Pay in 4
- Affirm Financing
- Afterpay Financing
- Zip Pay in 4
- Financing through Apple Pay
- Financing through Google Pay
Learn more about financing & leasing here.
Similar Products
Top Amazon Reviews
Worth the money
I have to give this 5 stars!!! I was on the highway and my alternator light started flashing. I knew I had the proper wiring (1/0 ofc wiring) for the AGM and the ultra cap ran properly. This thing is a real beast, I was able to make it 135 miles with a dying alternator in a full size conversion van. I’ve had a 5000w audio system and a 200 amp alternator no dimming very easy to monitor with the voltage app and the price was incredible. I highly recommend this for your van life build or as an addition to your car audio system.
...
show more
Reviewed in the United States on June 18, 2025 by Ray Kustoms
Awesome
This thing is awesome I have not experienced any power drops since I installed it and my amps are pushing my subs super hard
Reviewed in the United States on September 5, 2025 by Kraig Cash
Excellent awesome car audio battery
Excellent for the price it performed as good or better than five to six hundred dollar car audio batteries
Reviewed in the United States on September 6, 2025 by skwidstyle
Used cap.
This is supposed to be B stock new products but mine came with an ecosystem growing on it and is sun faded and the case is deteriorating, it has a hole in the bottom where there was no hole in the box and one of the terminals was shoved through the box and damaged. This is shameful to receive and product in such shape. Dirt damage algea and all. Be careful buying these.
...
show more
Reviewed in the United States on August 5, 2025 by Tim Tim
Stops headlights dimming with around 2500 watts
Great deal and works well other than ive had some connection issues but not necessary to use
Reviewed in the United States on September 4, 2025 by Bret sani
Ultra cap
Definitely makes you music more punch helpful with the voltage I am seeing 200 W more on my meter package was great quality
Reviewed in the United States on June 7, 2025 by Amanda s.
Works great, Looks bad.
Basically the title says it all. The device works great and running a signal lead acid battery in my car, I'm able to keep my voltage over 14 volts. If I'm really pushing the system and my SALT 3k amp, voltage will hit high 13's for an instant. Tge Bluetooth connectivity to this ultra capacitor is awesome, the app is great if you need to start your car and your battery has died. If your on the fence about getting one, just do it. Once you use it for a couple of weeks you'll be coming back to get another. As long as you don't mind the scuff marks / physical appearance then you will love this item.
...
show more
Reviewed in the United States on October 11, 2024 by ReconRC7287
You aren't going to beat it for the money
Realistically for the price, you're not going to beat it. I use this on my system to help reduce voltage drop and I push around 3000 Watts. I recently swapped over my entire system to my new (to me) daily. The battery was so low it wouldn't start because I had the doors open all day trying to hook up my system and I turned on the app and put it in run mode and it fired right up. Definitely help keep my last car running because it went through alternators because of sound systems without capacitors before I got this thing. And it already has a lot of bad grounds but it stayed running because of this thing. I'll probably get a second one and some kind of solar charging mechanism to go with alternator charging just to be safe when I upgrade my amp to something bigger.
...
show more
Reviewed in the United States on March 3, 2025 by C Hawley C Hawley