If you buy the battery alone it will have 3 years warranty. If you buy the battery with, for example, a kit ("they said an elegible product")AND ALSO ENTER TO RIDGID.COM, inscribe your product and send the original receipt, with the original upc, and a printing where you inscribe the product, to the address that they give you in the site, it will have a LSA warranty. Once they verified your documents, they send a notification about the inscription in the LSA plan. And yes, in this instance, include the batteries!!!
The following is a copy and paste from the Ridgid site:
RIDGID® Brand Hand Held Power Tools, Stationary Power Tools, and Pneumatic Tools are automatically covered under a 3-year Limited Warranty. This 3-Year Limited Warranty begins from the date of purchase shown by a valid receipt. If a valid receipt is not available, the 3 year limited warranty period begins from the date of manufacture on originally purchased equipment. For batteries and chargers, if the receipt is not available, and the battery/charger serial code differs from tool console more than 12 weeks, the origin of the battery/charger cannot be verified. In this case, the tool serial code must be used to verify warranty, NOT the battery/charger serial code. Note that all accessory batteries and chargers sold separately must have a valid receipt to verify warranty status since they are not sold with a tool console in a kit.
Lifetime Service Agreement
The original purchaser of an eligible product may elect to register for a free Lifetime Service Agreement. To accept this Lifetime Service Agreement, you must register your product and submit proof of purchase for processing approval as described below. The Lifetime Service Agreement provides the original owner of qualifying RIDGID® Brand tools a lifetime of free replacement batteries, free service and free replacement parts subject to the limitations set forth below.
The Lifetime Service Agreement is available free of charge, on all eligible RIDGID® Brand hand held power tools, stationary power tools and pneumatic tools, subject to the terms and conditions stated below. Customers have 90 days from date of purchase to register tools for the Lifetime Service Agreement. Once all conditions of the registration process are fulfilled, the tool’s service coverage lasts the lifetime of the original purchaser. The Lifetime Service Agreement status on a tool is not transferable to persons other than the original purchaser. Note: The RIDGID Lifetime Service Agreement is only available for eligible RIDGID tools purchased at THE HOME DEPOT.