When you click on links to various merchants on this site and make a purchase, this can result in this site earning a commission. Affiliate programs and affiliations include, but are not limited to, the eBay Partner Network.
Was cleaning the engine bay of the new to me 2010 C207 and removed the air box cover and saw a tiny H6 AGM battery. It is too small that it wont clamp down. I need to replace this thing before it decides to jump and destroys the box and other stuff. Upon looking at the online stores it gives H6, H7 and H8 sizes. So either ot is a H7 or H8 but wont risk buying the wrong one so help out if you know the original size.
2016 E350 4Matic wagon, 2019 Ford Expedition, 2019 Chevy Bolt EV
all of those H batteries (there's an H9 too) should be held down by clamps on a flange on the bottom of the 'front' and 'back' side of the battery. all of them are the same ~ 6 7/8" deep and ~ 7.5" high (really, 175mm x 190mm), the H6 is about 9.4" wide, the H7 is 11" wide, the H8 is almost 14" wide, and the H9 is about 15.6" wide. You should always be able to physically fit a smaller H size into a larger H tray.
Last edited by Left Coast Geek; Jul 6, 2024 at 04:05 AM.
Generally yes, but for US, it is the list of gadgets, what require bigger battery capacity. Those power seats, who operate without engine starting, safety lights that stay on after you lock the vehicle take some extra power.
But European version often have H6 batteries for V6 diesels, when in US everything goes H8.
When you are in cold climates, you can use the extra capacity for seat heaters, but in warm climates, you are carrying extra dead weight.
You can still buy flooded H6 for about $80, when good looking one at Costco is about $110.
2015 SL400 (M276 Turbo), 2014 C350 Sport (M276 NA), 2004 SL500 (M113), 2004 Audi TT225 (BEA)
Originally Posted by Left Coast Geek
These cars are supposed to have AGM batts.
Concur. The importance of getting the right and proper battery cannot be overstated since modern Mercedes cars are so temperamental when it comes to electrical sources. The wrong battery will cause all sorts of phantom problems. It is generally recommended to get genuine Mercedes batteries from the dealer. (However, I haven't but paid enough for the ones I got that the dealer would have probably been cheaper.) Definitely need to stick to AGM batteries. AGM and traditional (Flooded/Wet Cell) batteries have different charging profiles. Putting a flooded battery in place of an AGM battery may cause over-charging.
2015 SL400 (M276 Turbo), 2014 C350 Sport (M276 NA), 2004 SL500 (M113), 2004 Audi TT225 (BEA)
And this is what I currently have in my SL400. I replaced both my batteries when I would have random blind spot failures. Not sure if both needed to be replaced, but I did anyway. I have the old batteries on CTEK trickle chargers.
Mercedes SLR McLaren 722 S Is Extremely Rare Example Modified by McLaren
Slideshow: A one-of-one U.S.-spec Mercedes-Benz SLR McLaren Roadster became even rarer after a factory-backed transformation at McLaren's headquarters.
