I just replaced my dead Zenipower OEM cells with Varta 1254 A3. So far the battery life is exactly as specified by Sony. We'll see if the Vartas can handle the charging regime.
2014 Mazda 3, about 65k km.\n\n2nd battery only because I left the lights on one time a few years ago and needed a replacement. Nil problems otherwise.
2018 Mazda 6 is going fine.\n\nProbably due for a battery soon as preventative maintenance.
Adding my experience here for others that may stumble upon the thread. I was having really bad+inconsistent battery life with my left and then right buds, where they would die in less than hour. I replaced the both earbuds original batteries with the Varta CP1254 A3 battery and also did a hard reset.
It took a little over an hour to do and finally the battery life is decent again. I was able to run them for a good 3 hours on noise canceling with max quality settings and it's a night-and-day difference.
I've had some good luck with OEM Vw therye where either Varta or another OEM factory battery. 7 years on one...and also 3 years till 50%, lots of variables, to make a battery last or not last.
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+%.
Am luat una noua, Varta. Firma, calitate ????. Am luat-o acum 2 ani, start-stop a mers fix 3-4 luni, si acum, mai ales cand e frig, se chinuie.
I have the same problem with my Mazada 3. Changed the battery while still under warranty and still does it. I don't leave anything pluggeded in and it still dies overnight. I purchased a battery tender and have to hook it up every night or get a boost in the morning.
Even then the Mazda oem battery is trash. My battery only last me 15k miles, and I bought it new.
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