I just now successfully replaced the battery with a varta cp1254 a4 due to the right one going bad after a year of use, testing it for a few hours now and it worked!
I've been using the varta cp1254 a3 (60mAh) in my left earbud for about a month. The difference is very small (less than 10%). From full charge to low battery warning, varta 20%, zenipower 25+%.
The entire suspension was recently replaced with German parts, along with a full upgrade of rotors and low-dust ceramic pads on all corners and a new Duracell battery a few months ago.
I replaced mine with a Duracell branded battery from Batteries Plus. Direct fit, vent tubes connected right up.
Threw a Duracell 12v in my second gen Honda Insight, and it did fine for the six additional months I had the car.
I got an already fully charged duracell battery at my local Batteries and Bulbs location in California. Works like a charm just needed to get top posts for it to work in the i3.
I've put my trust in Varta. Previously had Bosch. I think you can put your trust in pretty much any brand if its covered by a 2-year warranty.
We needed to replace the original German Varta battery in our '14 A4 (date code Jun '13) after the first polar vortex in early '19. OE list was $227 (non AGM), discounted to about $195 at the local Audi parts counter. Advance Auto had an equivalent H9 for about $170, but the local store only had one with a late '16 date code (and proper BEM sticker). So they sold it to me as a \"used battery\" (after running their condition test and passing) to me for $45 + tax. Two years later, so far, so good.
Replaced with: Duracell Ultra Platinum AGM Battery SLI49AGM
my 2019 GolfR battery died recently. well, it wouldn't hold any capacity and had to be charged every few days. anyway, i had my warranty apppointment today at the dealer and stood outside for an hour. i was wondering why it took so long. the new battery is a 000.915.105.CB.DSP. hopefully the AGM battery will do better with mine too.
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