This is a matched pair of 4AWG ring-to-ring terminal cables (black and red), 21 inches long, built to connect BigBattery lithium-ion batteries to inverters, busbars, or other system components. If you need a heavy-gauge, ready-to-bolt cable set for a battery bank build, this is what you're looking at.
Ring terminal cables are a common failure point in battery banks when the gauge is undersized or the terminal fit is loose. This 4AWG set is built for BigBattery lithium-ion systems, using ring terminals on both ends for a bolted, low-resistance connection rather than a friction-fit lug. Note: If you would like to review the manufacturer Product Specifications, Warranty, Brochure, etc., for this system, please refer to the "Resources (System Manuals and Warranty)" Tab above on this page.
Critical Fitment & Requirements
- 4 AWG wire gauge, ring terminal to ring terminal on both ends
- 21 inches in length, sold as a black and red pair
- Designed for BigBattery lithium-ion battery systems
- Suited to mobile energy storage systems, golf carts, RVs, and off-grid setups
- NOT confirmed for terminal/lug compatibility with non-BigBattery battery systems - verify ring size and stud diameter before use [NEEDS VERIFICATION]
- NOT a substitute for OEM-specified cable length - do not stretch or splice to reach a longer run
Ring terminals loosen over time from thermal cycling, especially on high-draw setups where the connection heats and cools repeatedly. A loose ring terminal raises resistance at that joint, which shows up as localized heat and, left unchecked, can lead to thermal runaway at the connection point. Torque every ring terminal to the battery manufacturer's stated spec using a digital torque wrench, not a hand-tightened guess. Re-check torque after the first 24-48 hours of cycling, and reference NEC guidance on terminal torque and ampacity for 4AWG conductors before committing to a fixed installation.
Key Benefits
- Heavy-duty 4AWG wire reduces resistance for high-power applications
- Ring terminal connections on both ends reduce risk of disconnection
- Color-coded black and red pair simplifies correct polarity wiring
- Built for BigBattery lithium-ion configurations, matched to expected current loads
| Spec | Value | Unit |
|---|---|---|
| Wire Gauge | 4 | AWG |
| Length | 21 | inches |
| Terminal Style | Ring to Ring | - |
| Set Colors | Black and Red | - |
Note: See "Resources (System Manuals and Warranty)" Tab above for full specifications.
Compatibility & Fitment
- Fits: BigBattery lithium-ion battery systems used in mobile energy storage, golf carts, RVs, and off-grid setups
- Does NOT have confirmed fitment for non-BigBattery battery terminal or lug configurations [NEEDS VERIFICATION]
- Sold as a fixed 21-inch pair - not intended to be cut, extended, or spliced for other run lengths
| Compliance Item | Detail |
|---|---|
| UL Listing | [NEEDS VERIFICATION] |
| NEC Ampacity Reference | [NEEDS VERIFICATION] |
| IP Rating | [NEEDS VERIFICATION] |
FAQ
What gauge wire is this cable?
It is 4 AWG copper wire, sized for high-current transfer between batteries and system components.
How long is this cable?
Each cable in the pair is 21 inches long, terminated ring-to-ring on both ends.
Does this come as a black and red pair?
Yes. The set includes one black and one red 4AWG ring-to-ring cable for positive and negative runs.
What is this cable designed to connect?
It is designed for BigBattery lithium-ion battery systems, connecting batteries to system components such as busbars or inverters in mobile energy storage, golf carts, RVs, and off-grid setups.
Will this fit any lithium battery brand?
It is built for BigBattery lithium-ion battery systems. Fitment with other brands' terminal or lug configurations is not confirmed - check your battery's terminal spec before ordering.
Warranty & Registration
Manufacturer warranty terms for this cable are not stated in the source data. Refer to the "Resources (System Manuals and Warranty)" Tab above on this page for the manufacturer's current warranty documentation before purchase.
