Varta are the best ones I ever used. I use them in my car key too and its the only battery that lasts years instead of 2 months at most.
I still use a factory Audi (Varta) from 2014, so 11 years, but I'm not sure it will survive the first -15-25C this winter.
My VARTA on the e46 compact lasted 8years
Varta make some good shit.
I had to change the battery on my Volvo 940 7 years ago, it was the original battery from 1996 Wich means that my battery lasted for 22 Swedish winters.
My 2017 original battery stayed alive for 8 years and 148k miles fascinated me how long it lasted and the fact that the auxiliary battery is still fine
The factory battery in my 2007 S60R lasted just under 10 years, and I thought that was remarkable. Much more expensive than an auto store battery though but you get what you pay for I guess
My 3 years old XC60 battery has been diagnosed as bad 55% last 2 weeks ago, I said to them keep it as I feel they are still good and road worthy. Gonna do a snapshot again at another 6 months to evaluate.
The battery is trash - if it was at 4v, the cells are either internally buckled/shorted - or the AGM is damaged and thus will not hold any charge (no capacity).
Paid charging is problematic mainly because the T8 charges so slow. You'd have to leave your car at a charger for like 5.5 hours to fill the battery.
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