From 2 recent posts that I made in another forum:
"For 18 years I have been using Sears Die-Hard Gold batteries in our Gen I and II Vipers(total of 5 here now). Some of these have lasted 8-9 years using battery tenders. Unfortunately, in the last 5 years, the average lifespan on this model seems to be falling...with several making it less than 2 years. Of course, Sears kindly gives me a new one, but I do not enjoy changing them out on these 5 Vipers every couple of years!! Admittedly, our newer Vipers are much easier to remove/install batteries.
Another factor is the dwindling number of Sears stores around here.
In case you have not noticed it, there seem to be Auto Zones everywhere...making it very easy for the occasional return if necessary.
Finally, whatever you choose, read the date on the battery...accepting none more that a few months of age. Also, ask them to test the voltage in the store before you buy one...if below low 12's...get another one. I have turned down "new" batteries testing in the 11 volt range. Could these batteries be rehabilitated...maybe...but I am not willing to try since removing the wheel, etc. is the penalty for such folly.
Finally, I will not put a new battery into a Viper (especially Gen I and II) without charging it with the appropriate charger for at least a couple of days. Even after that, I will let it sit off of the charger for a day or two to test voltage before putting it into a Viper."
ALSO:
"I will share a fact or two. Dealer installed a "Mopar 72 month" battery in a friend's Viper...and it lasted 2 years and 11 months. I made a "housecall" to install a new battery purchased from another source. When we visited installing dealer for possible prorating...we found out two things: First, this "72 month" battery had full exchange warranty for only 18 months (50% less than other similar bttreries costing much less)!! Second, battery MUST be in the car and read by instruments at the dealer before any warranty can be considered...NEVER MIND that we had full service records and bill of sale for said battery. Since the $$$ would by tiny, and we had no intention of reinstalling a completely dead battery into this Viper and then trying to get the car to the dealer for verification...we passed...and Fiat won again. SAD !!!"