I would ask them to show me the policy change IN WRITTING
... they can produce a document ask for a copy.
Then take my original sales copy and file in my local Small Claims juristriction to get the expected value of the original warranty (based on the number or batteries expected for the remaing time I would own the vehicle) in my demand.
I bet the manager will balk at your request - and then as you stand there waiting ... just give you another battery to make you go away.
If not, or he won't/can't show the policy change in writting, ask him for the contact information for customer complaints at Firestone.
A warranty is a written performance document (and contract) between you and the original provider (Firestone DBA J.C.Penny Auto Center) - it can only be changed if you agree to the changes.
If they fail to perform you have legal right to proceed and recover your replacement battery value ...
I've got lots of 'Limited' lifetime warranty parts on cars - brakes, alternators, starters, water pumps and etc. - when they go bad I take them back
Do get 'the look' at times but usually they give me the parts with no questions after I hand them the paperwork.
Went through the "we don't do that anymore
" a few years back with Bendix over a "Lifetime" friction material replacement warranty - same truck (owned since new in 1977), Bendix pads bought in 1984 - on it's 4th replacement set of front pads now, last three free
Took a minor amount of time and one letter to get the last set ...
I don't turn-over of some of the 'fleet
' very often
I fiqure they'll put a 'hit' out on me eventually - it would cost them less