I'm running a 320 amp alternator with AGM odyssey battery so far no issues
I’ve had good luck with the VW OEM Varta batteries.
I wasn’t happy with the replacement options for the old Mercury batteries. So, I stumbled upon the Varta V80H—a battery usually used in servers—and I built a charger for it. It’s the perfect match: it has good discharge characteristics, high capacity, slow self-discharge, and it's rechargeable!
I get all my batteries in Screwfix. They do Varta brand which are exceptionally good for the price.
Commenting here for others to find. 5TA915105B has dimensions that align with Group 48/H6 specs. I bought an Odyssey 48-720 and it was a perfect fit. Bonus tip - FCP Euro has it for $250 and it includes their lifetime warranty.
I got ten years on a Varta in my MB 212. When I changed it out I was really surprised it was the original w/97k on it.
Varta is pretty good
Just replaced this battery in my Leon. Got the Bosch 096 agm for £127 from Tayna batteries on eBay.
The original Varta battery lasted 11 years and still worked but began showing signs it needed replacing.
The older VARTA battery could only hold a charge for 15 - 30 minutes at the end. It has been in use since January 2020 and was out of use for 8 months in 2022.
ZeniPower battery could still hold a charge for a long time. Estimating 5-7 hours.
Odyssey and wasn't a fan died quick
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