Mighty Max Battery YTX14-BS Battery Replacement for Mercedes Backup Auxiliary 2115410001

After reading the reviews on this battery I was a little worried that the other folks who had mentioned the issue of the bolts/nuts not fitting would also create an issue for me. I didn't need to worry! Installation was a breeze. I unbolted the securing bracket, removed the negative battery terminal first (as you ALWAYS should) then the positive terminal; and simply lifted the battery out.Installation was just as simply, facilitated by the fact that the battery terminals have a neat little trick. The nuts inside the terminal can be located for a side or top bolt mount. I simply slipped the nuts from their side mount shipped position, added a little dielectric grease to hold them in the top mount position, and simply used the OEM captured bolts. It really was simple! The whole job took less than 10 minutes to complete. Gone is the warning light on the dash!It really is perfect for the job, and given the price compared to the OEM battery, great value. I'd buy it again, and recommend it to anyone who needs to replace the auxiliary battery in their Mercedes E Series or W211 car.

Easy to install and working great. Fixed auxiliary battery malfunction error and vehicle is operating perfectly. I would advise that this battery be charged with a trickle charger before installing. It comes charged but is easier on the whole system to fully charge it up prior to install. Also, do disconnect the negative terminal on the main starter battery under the hood before swapping out the auxiliary battery. Just good practice.

Battery came in with around 70% charged. OE Italian battery was designed for 170CCA but this battery exceeded 250CCA with my tester which is great. Almost same weight. Unlike OE battery terminals are not threaded but it comes with nuts that are the same size as the bolts on the cables. Since it's AGM it is expected to not having a vent port. Good packaging. For the price and quality it's a steal.

2016 Mercedes-Benz CLS 400 : I was having a SRS malfunction light pop up on my dash and then the car wouldn’t start. By chance I remembered I had an auxiliary battery message before all this and went ahead and ordered this in hopes I would have to take it to the shop and pay a lot of money . And IT WORKED , got to put the nuts inside where the bolt goes to hold in place or else it won’t go in . But then I had to charge my main batter for a bit . I’m sure you can jump start it to . But it turned on no issues . Drove around for an hour to make sure . Saved me time and money . Don’t let you’re auxiliary battery die on you

Bought this battery for my 2015 Mercedes CLA 250. my car have been acting weired on the Start Stop feature on the car ! when it when to a stop on the road! when coming back to drive the car will cease! I had to restart! no indication of changing the AUX battery! but after reading much I found out it maybe the battery! bought this and follow youtube to install! it was really simple ! unscrew the two wire and battery fit like a glove ..Battery has same spec and size as the Mercedes OEM battery which cost 5 times the price. Overall! am happy with this purchase. After changing all works AOK! screw back the screws and pop back the covers !

Lasts for just over 2 years! I bought one of these 2 years back and it has just stopped holding the charge. I ordered again because It's still worth it for It's price compare to original Mercedes price.!!

Good fit for 2015 E350 wagon. You can use the original terminal screws, but you must use the nuts supplied witht his battery, they slide under the terminals, a bit of a pain to line up but doable. (Keep a magnetic grabber tool handy.) The original battery has an overpressure exhaust port on the side into which a routing tube is inserted. This replacement battery has only a tiny overpressure relief hole on the top of the battery. It will get covered up by the battery clamp, so I sealed the hole with duct tape and drilled a hole off to the right side, still on the top of the battery, where the tube can reach and is not blocked by the battery clamp. If you select the right drill bit (must be metric, I didn't have the exact size but a 3/16“ worked after I reamed it out a little), the tube end plug will fit right into it. There is empty space between the top of the battery shell and the innards, so just drill lightly until you puncture through and you'll be fine.

Our auxiliary battery died, which caused our car's main battery to completely die out. Of course I first thought about bringing the car to the dealership but found reviews this battery also works with a Mercedes. It fit in the slot but it was difficult to bolt down properly. We used the original bolts that came with the Mercedes but had to wiggle things around... pretty challenging given the small amount of space we had to work with.The hole on the battery is then covered by the car strap. From reviews, this hole allows pressure to escape and its recommended to drill a little hole through the black plastic. We did this on the top. Once we installed it, the car didn't just turn on so we had to jump it and let it run for 10 min. It's been months since we installed it.. the car works fine. Crossing fingers!