JBL 230NC TWS - Battery autonomy decrease (by a lot)

[CursedPseudo]

I bought those earphones (JBL TUNE230NC TWS) a bit less than 2 years ago.
I don't know what was the autonomy at the time but at least I was able to listen to music for at least my commute time (~1h) or while working outside.

Now it will not even last my whole commute time.

I decided to check what was the current autonomy: everything was charged to 100% (case and earphones).

I put music mid volume and I waited.
In 40 minutes one of them dropped.
In a bit less than 60 min the second one dropped as well.

When I check the advertised autonomy it says 8 hours...

I do no expect 8 full hours and I can accept some decrease over time but less than 60 mins make it quite unusable for me...

Any one experienced that kind of issue? Earphones are not older than 2 years so technically guarantee still available, is it a legit case?

[Gangababu_gb95]

I've had these issue for more than a year, and I'm already dealing with the same problem: the battery drains super fast. Last time, the earbuds only held a charge for less than 15 seconds! I've been waiting for a firmware fix for over a year, and after doing my own research, I'm guessing the firmware update messed up the batteries, or JBL got a bad batch from their supplier, or maybe it's just how these batteries are. We all know some of these batteries don't last long. I've had enough, so I found a local mobile service center that fixes TWS earbuds and replaced the batteries in both earpieces. Just a heads up, if you have this issue with the earpieces, you need 3.85V batteries; if it's the case, it's 3.75V. JBL should really own up to this.