0
Authorized dealer · Car Audio Bargain
Lithium iron phosphate chemistry gives XS Power xMax LiFePO4 batteries a combination of light weight, deep usable capacity and long cycle life that suits reserve banks and accessory power. Every model is 12V, with the xMAX 45, 67, 90 and 135 stepping up in size, plus an xMAX 90-DIY variant.
LiFePO4 holds a fairly flat voltage through much of its discharge, so amplifiers see steadier supply voltage as the battery is drawn down. That makes XS Power xMax LiFePO4 batteries a practical choice for a rear reserve bank, for long listening sessions with the engine off, or for vehicles where weight matters. Keep in mind that LiFePO4 is a different chemistry from lithium titanate, with its own charging voltages, and it should not be paralleled directly with an AGM or LTO battery without isolation.
Larger models store more energy and take up more room. Estimate how long you play with the engine off and how much current the amplifiers draw at your usual volume, then pick the size that covers it with some margin. Check dimensions and terminal layout on each product page against the space you have.
Use a charger with a LiFePO4 or lithium profile, and confirm the alternator's voltage suits the battery. Many LiFePO4 batteries restrict charging below freezing, so review each listing's temperature guidance if the vehicle sees cold winters. Fuse the positive cable close to the battery with parts from our fuses and fuse holders collection, and size wire to the current and run length.
An xMax LiFePO4 battery near the amplifiers pairs well with an AGM or lithium main battery when the two are separated by an isolator. Heavy 1/0 AWG power wire handles the front-to-rear run. If you need 14V or 16V lithium or direct-fit group sizes, compare the TITAN8 lithium batteries, or browse every chemistry in the lithium batteries collection.
Shop Pay InstallmentsPay over time, powered by Affirm
Lease-to-own with SnapNo credit needed¹
Pay later with SezzleFlexible payment options
Shop Pay Installments: Rates from 0-36% APR. Payment options through Shop Pay Installments are subject to an eligibility check and are provided by these lending partners: affirm.com/lenders. Options depend on your purchase amount, and a down payment may be required. Snap: The advertised service is a lease-to-own agreement provided by Snap RTO LLC. Lease-to-own financing is not available to residents of Minnesota, New Jersey, and Wisconsin. ¹ Not all applicants are approved. While no credit history is required, Snap obtains information from consumer reporting agencies in connection with submitted applications, and your score with those agencies may be affected. Sezzle: Issued by WebBank or Sezzle. See loan agreement for details. Refurbished items are not eligible for financing or leasing.
Before you browse
We use cookies to run the store, to measure how it performs, and — only if you allow it — to show you our products on other sites. You can change your mind at any time. Read our privacy policy
Necessary cookies always run — the store cannot work without them. Everything else is your call.
Necessary
The cart, checkout, sign-in, fraud prevention and security. These cannot be switched off.
Preferences
Remembers your currency, region and recently viewed products.
Analytics
Measures how the store is used so we can fix what is broken and improve what is not.
Marketing
Lets us measure our advertising and show you our products on other websites. Turning this off also opts you out of the sale and sharing of your information for advertising.
