Based on my online chat with SONY, it seems they don't provide battery replacement service but they do sell the TWS in loose in case you want to replace it . But I will just wait till newer version release and change to new one, since I know this brand new battery condition can only last me for 1 year plus...

It's a known issue worldwide. Though I'm not sure if Sony Malaysia acknowledge it
Other countries allows for exchange even for out of warranty units

Source:
https://www.reddit.com/r/SonyHeadphones/com...battery_issues/

thanks for your good info , i will visit sony service center lalaport within this 2 week.

I'm having same battery drains issue for my earbud and got another 3 months warranty left. Can I go to any Sony Centre at my place to get it replaced or do I need to go to specifically Sony Service Centre? Just curious whether I can claim the warranty at normal Sony Centre since I bought it online.

Sony Xm4 is selling at sgd249 now. Is it worth it to get than the latest XM5 which is sgd419?

Mine is out of warranty for 4 months, battery drained was bad as one side can only tahan less than an hour. I send it to the sony service centre and now I gotten an notification that I can collect but the amount this RM 444. Wth? Why would I pay that amount to get a 'replaced' XM4? I might as well don't collect and just throw away my 'old' earbuds.

Called the hotline and the lady say cannot discount or waive the charges.

Sorry to bring up the old post.  Like you, I was lucky to have my 1000XM4 replaced few months before warranty expire, but now, my right earbud drain from 90% to 20% less than 20 minutes. left side seems still ok but definitely less than 6 hours.  I would not consider anymore Sony wireless earbud. I think XM4 is last batch Made in Malaysia, XM5 is now made in China?

I used to be active in Sony Community Forum on this 1000XM4 battery drain issues... but Sony had closed down this community forum.

Free replacement was only for a limited time sadly