XS Power xMAX 135 12V Lithium Car Audio Battery
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.
At 135Ah of usable lithium capacity and a continuous power handling figure that dwarfs traditional batteries, the XS Power xMAX 135 is purpose-built for the most demanding high output SPL builds on the market. This LiFePO4 / LFP battery delivers sustained, stable voltage through extended competition runs and back-to-back musical hammerings without the sag that kills scores and sound quality. Builders who have graduated past the limits of lead-acid chemistry — and even past conventional lithium packs — find that the xMAX 135 simply keeps up where others tap out.
Deep Capacity, Zero Excuses
As a primary lithium car audio battery or the anchor of a multi-battery supplemental system, the xMAX 135 offers deep cycle endurance alongside explosive current delivery. Its low internal resistance keeps voltage drop minimal even when multiple amplifiers are swinging hard simultaneously, making it as effective in a wall build as it is in a competition vehicle chasing record numbers.
Specifications
| Battery Type | 12-Volt Lithium (LiFePO4) |
| Group | GC12 |
| Continuous Wattage | 15,000 |
| Amp Hours | 135 |
| Features | Ultra Lightweight, High Shock Resistance, Stable in Extreme Temperatures |
| Weight | 46.7 lbs |
| Length | 15.12 in |
| Height | 9.25 in |
| Width | 11.50 in |
| Warranty | Four Year |
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
