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I would wait as long as the battery is in good shape. Does it have caps for adding water? If so, make sure it doesn't need any water (add only distilled water). Then I just keep a portable battery pack in the car for emergencies. The new lithium ones are tiny and very portable.

 

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It is a sealed AGM battery - no water.

I would say 9 years is working on borrowed time.

I wasn't sure if they were using AGM back then - I knew it was in my '14. Yes battery is probably on borrowed time. If I had the money, I'd replace the battery with a new AGM at my convenience. The old wet batteries were easier to check the acid health and sometimes lasted an amazing number of years if you kept up with the water.

 

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If you have a BatteriesPlus in your town, they offer a four year warranty on their auto batteries. Most other places offer three years. Some parts places will not install the new battery if it is under the seat like mine.

I've been lucky. Never been stranded by a dead battery, but I have used my jump starter once or twice over the years. Mostly I've used my jump starter to help other motorists - it is much easier than jumper cables and no risk to my vehicle in the process.

 

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I got a great deal at BatteriesPlus. On St. Pat's day they had a 20% off coupon and that plus the 4-yr warranty sealed the deal. They frequently have 10% off coupons floating around and keep emailing them to me. I don't have Costco around here, and Sam's was about the same price as BatteriesPlus with only a 36 mo. warranty.

 

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Happy Monday! For those considering a battery purchase: Batteries plus is offering 15% off battery purchase if you buy on line and pickup at store. The discount code is EMAIL15 and offer is good 10 May 2021. Hope this helps someone out. They also installed the battery for me for no charge and used a memory saver plugged into the OBDII to avoid a hard reset of everything.

 

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Those of you that are changing from DLG batteries to AGMs are adjusting the charging strategy in the ECM correct? They do require a different strategy or your just going to end up killing them pre-maturely anyway. My 08 Grand Cherokee with the 3.0L CRD is DLG Group 49 from the factory. Local shop convinced my dad into upgrading to a nice new top of the line Interstate H8 AGM because "it's the latest low-maintenance technology" without using the scan tool to adjust charging strat (it is after all a complete Mercedes Sprinter drivetrain with a Jeep body on it). Battery dead-dead within 2 years. Inherited the car from him with 28000 miles on it and went straight back to a H8-DLG 49 Duralast Gold from Autozone with the 5 year warranty. Battery lasts to end of non-prorata warranty every time even with all the hundreds of -20F remote starts in the winter. Don't put an AGM in the car if the ECM doesn't have a charge strat adjustment, or you don't have access to a proper scan tool because you're just wasting your money.

Actually going to swap the battery out tomorrow because this is my last 5 year non-prorata warranty battery and its up at the end of the month (they've since gone to 3 years non-prorata unfortunately) and might as well keep the endless cycle of free batteries going. Become good friends with your nearest AutoZone store manager, it will pay large dividends in the long run in endless supplies of free brake pads, rotors, batteries, pretty much anything with a good or lifetime warranty length. I change the battery right before the end of the non-prorata warranty no if ands or buts because why not, its free. Then buy new battery, warranty old immediately requesting refund instead of replacement, buy new battery, rinse and repeat. Why pay for batteries if you don't have to. It is entirely the managers discretion on replacement/refund/etc.

Even sites like RockAuto warn to "have access to a service specialist before replacing battery." Just a general heads up.
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Interesting food for thought. I "upgraded" my wife's volvo battery from a standard lead acid battery to an AGM when we bought it in 2013. I was so excited to divorce myself from the leaks and vapors from the old lead acid batteries and no longer had to fool with acid absorbing mats, corroded connections, etc. So far the AGM battery is doing good, and seems to tolerate the charging strategy of the old volvo electronics. I guess its been over seven years, so I think I got my money's worth from that old AGM. A new battery is probably in my future for the volvo, and it will probably be another AGM. Since my Trailhawk came from the factory with AGM, I assume their charge strategy is already where it needs to be - of course as we've all read here the ones with auto stop/start seem to eat batteries.

 

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Odyssey batteries are pretty expensive compared to standard AGM batteries that most places sell. BatteriesPlus has some low-priced, mid-priced, and premium priced batteries (pretty sure they carry Odyssey and another premium brand). Pretty sure my Trailhawk with V6 takes an H6 (Group48) battery to make room for the auxillary battery; but the search tool on some autoparts stores point to the H7 for some reason.

 

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I measured my existing battery and then compared it to the dimensions of the various standard sizes. It's weird, but my ended up being a H6 based on the dimensions - so that is what I bought. I think the H7 size is about 1.5 inches longer than the H6. There was probably room for an H7 in there; but I didn't want to mess with the brackets.

Standard BCI Group 48 batteries feature dimensions of (L x W x H) 12 1/16 x 6 7/8 x 7 9/16 inches (12.0625 x 6.875 x 7.5625 inches, 306 x 175 x 192 mm) and is similar to the standard DIN H6 battery