ACDelco 48AGM Professional AGM BCI Group 48 Car Battery with Auxiliary Positive Cable - Reliable Power for Trucks, SUVs & Heavy-Duty Vehicles | Cold Weather & High-Performance Use

I have had this battery for 18 months now, and I'm very happy with it thus far. I've been using AGM batteries in my work for quite a few years (stand alone solar powered automation and control systems) and they are very good performers when treated properly. I've seen them last as long as 7 years in 24/7 duty which to me is quite impressive considering that they're maintenance free. I live in the high desert of NM, about 3200 feet above sea level, and the dry climate and extreme temperatures, regularly above 110 degrees in the dead of summer, wreak havoc on traditional flooded lead acid batteries. They require constant acid level checking and even still always seem to die an early death. In the application I've implemented this battery in, my 2011 Suburban Z71, I'm constantly off road and my truck sits idling regularly on job sites, with underhood temps at very high levels. My "wet" batteries prior to this one generally last a year to 18 months, and the last 3-6 months of their lives are generally indicated by slower cranking and extremely fast discharge with small current loads like my cell phone charger being left on overnight, which honestly is the norm for me. I also run a large inverter for power tools on a regular basis; it's hard wired in and mounted on the floorboard of the vehicle. At 18 months in service this battery still performs like new, which it makes it the best battery I've had in my primary work vehicle in many years. For reference, I've been using the top grade (most expensive) WalMart batteries and my results have been somewhat disappointing, as previously stated. I live in a small town and don't have a lot of choices with things like automotive batteries. The 3 year free replacement warranty gives me a warm fuzzy but I'm betting (and hoping) I won't need to use it. I'm preparing for my second winter with this battery but I'm confident it will hold up based on its performance thus far. Chances are I will own this vehicle until this battery finally fails, and at that point I will update this review. For the time being, it's everything I could ask for in a battery, with lots of cranking power and reserve capacity, and it has done very well with the somewhat extreme workload I've placed upon it. Some big strides have been made in AGM technology in recent years, namely higher current output which makes it more appropriate in automotive applications, and this battery bears that out nicely. I'd say that it's everything I had hoped it would be when I made the switch to AGM for my primary/work vehicle, worth the extra cost in extended life and less hassles with maintenance. I switched to AGM with my Honda GL1800 motorcycle a couple of years ago and the results there have been stellar as well. I hope that my review helps with your purchase decision.Update 10/2/17: Still going strong at 2-1/2 years in service and zero maintenance. Chances are that ACDelco Pro AGM will be my new battery of choice, in spite of the higher price than conventional batteries. Well worth it to me; it appears that longevity will more than offset the price differential. And the less I have to extract a dead battery from my engine compartment, the happier I am.Update 9/7/2018: Still performing as new, 41 months in. It's a keeper.Update 2/27/19: Made it through another winter with no issues. I'm so happy with this battery at almost 4 years in service.Update 11/8/19: This battery is still happy and healthy at 4.5 years in service. Starts my 5.3L V8 Suburban reliably in recent subfreezing weather. I should also mention that my battery terminals are clean, shiny, and corrosion free; it looks like the battery terminal posts are very well sealed against acid and fumes leaking out and destroying cable ends and clamps.Update 4/22/20: 5 years in service without so much as a hiccup. Still plenty of cranking power and zero issues. The extreme workload I mentioned earlier in this review has diminished somewhat these days. My Suburban is more of a daily driver now, although I still use the large inverter regularly for this and that. I replaced the factory alternator at about 105K miles in this vehicle; it was still charging just fine but the bearings were starting to get dry and a little noisy, and I didn't want it failing on me at an inopportune moment (like being many miles from home). But I digress...I'm super pleased with this AGM battery purchase 5 years later. It's been awesome, and shows no sign of giving up anytime soon.Update 10/19/20: 5.5 years in service and still going strong.Update 12/15/20: With subfreezing temps in the teens over the next couple of days here, I thought it best to do a quick health check of this battery considering it's age. I used a carbon pile load tester and it's putting out about 395 Amps at 50 degrees F, which is probably double what I need for cranking. I'll be keeping an eye on its freezing weather performance but I think it will do well.Update 3/1/21: This ACDelco AGM battery made it through the recent Arctic blast with no issues; reliably started my Suburban at 5 degrees F. It's 2 months shy of 6 years old and still going strong.Update 5/24/21: Just passed 6 years since installation, and still working great. Possibly the longest lasting automotive battery I've ever owned.Update 11/5/21: 78 months / 6.5 years in service and still going strong. Temps in the 30s here this morning, and it's still cranking with power to spare.Update 12/12/21: Subfreezing weather has arrived, and this battery is finally showing its age. Slower than normal cranking this morning at 26 degrees F. I conducted a load test and it's down to 340 amps max output. I've seen a lot of sudden failures from traditional flooded batteries over the years, and the failure curve on this one seems to be much more gradual. It's nice to have some warning of impending failure, instead of having to arrange a jump start. I'll run it for a while longer as it's still doing the job, but a battery purchase is in my near future. This has been a really great purchase and has lasted for more than double the 3 year warranty. I highly recommend it, and have zero complaints.Final update 12/16/21: I ordered a replacement today. It's the same brand ACDelco Gold AGM, but I ordered the Group 94R/H7 instead of this Group 48/H6. It has much better cranking amp rating, reserve capacity, and AH rating, and it's $18 less at the time of writing this at $164. It's a little longer by about .6", but otherwise is almost identical and will drop right into my 2011 Suburban with room to spare using the factory battery holddown clamp. These 94Rs are factory equipment on the '14 and newer Chevrolet full size trucks and SUVs, and have the higher capacity to keep up with the ever increasing electrical loads as option sets continue to increase (I.E. higher power infotainment systems, auto pilot systems, heated seats and steering wheels, etc.). I hope it lasts as long as this one did, and I'm convinced that it's the absolute best deal on the market if you want a long lasting premium battery.These batteries fit perfectly in my '12 3500HD Duramax. They are identical size to those before. Chevy could have made getting them out and in easier...not the batteries fault. I did not rate longevity because they've only been in two weeks. I didn't rate "ease of install" because the area designed by Chevy stinks! Yes, I can chew out Chevy because I'm a GM guy.Great battery, great price but Amazon needs to wise up. Amazon claims this battery is not a fit for my 2015 Hyundai Sonata Limited 2.0T, but it is as shown in the photo. ACDelco and Rockauto.com both say it is a perfect fit. Amazon says the battery is 11.9" long, but it is not, it is actually 10.9" long. Several reviewers have pointed this out to Amazon in their reviews over the years, but the Amazon staff has done nothing to correct the misinformation. Amazon needs to hire workers who have experience in auto parts if they intend to sell them.I purchased this battery to replace the current one in my 2013 2500 Suburban. I decided to add an auxiliary battery to power components so the main battery won't drain while accessories are in use with the ignition off, like phone, tablet or laptop charging. Camping lights or trailer lights. Purchased most conversion parts on Amazon and local dealers to complete the install and was seamless.On an important note, it's suggested to top off the battery by charging when received. Not all batteries are 100% when shipped. This one was about 89% when received. Placed it on the charger and within an hour or so, it topped off to 100%.So this is a standby battery for me, sits in the garage.First, it's slightly less than 11 inches long, so the listed measurement is wrong, but that's what I was counting on. I looked up this exact model on other websites and it was listed correctly at 10 7/8.It was 12.75 volts when I got it, I use a NOCO Genius 1 to charge it. Now the pdf for this battery states not to use a trickle charger, so keep that in mind. Anyway It was still charging at 14,59 volts, I left and returned to garage to find it fully charged at 13.89 volts, so somehow the voltage dropped when fully charged so that's weird. So I disconnected the NOCO based on the instructions of the ACDELCO, I will charge again when voltage hits around 12.4 per instructions.NOTE: The instructions of the NOCO is conflicted, one section states do not leave unattended, (seriously?) and another section states you can keep connected indefinitely. I will err on the side of caution, but so far so good. I have not connected it to car yet.Original OE GM battery lasted 6 years of daily use year round (4 seasons) with no maintenance nor issues. Replaced proactively (still passed a load test). I'll use this one again for 6 years and buy another one then.Amazon stated this battery was not for my truck. However, as I delved deeper into the ACDelco website I found a chart stating the battery was in fact a compatible match.C'mon Amazon!!!It’s an AGM battery; good price great quality