I put in a Varta CP1254 A3, same form factor, similar enough specs.
UPDATE: I put in the bigger battery, it's great. The Cp1254 A4 gets me 1-2 hours extra use over the A3 and I believe even the original Z55H.
I just replaced my xm3 batteries (they are cp1254a3 with 60mah) and I replaced it with the newer version (cp1254a4 with 74mah). No issues and more capacity.
Yep. Varta is a good battery. My battery died this year in March. I replaced it and paid 800 for a Varta battery for my dodge charger. So far so good!
Varta battery refused to die even after 5years mannn that’s a wow ..to add on I don’t use my car often i use fireblade as my daily commute for the last two years..
My XM3s went from a good 6 hour run time down to 2.5 hours in about 20 months. The last month alone has seen 30 mins wiped off them.
I went with the Varta A4 models bought from a Czech supplier called [Battex.cz](https://Battex.cz).
Varta are a pretty decent brand of battery (although their consumer AAs suck), would not expect it from them.
fits perfectly in a NB
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.
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.
Got a Varta battery and it only lasted 1.5 years. My car is parked under the sun on weekdays but was expecting more from the battery
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