The battery drain issue on the right earbuds is a global known issue. Many countries are giving replacement (both earbuds , not just battery replacement) even if it's out of warranty. It's not just US and Europe but Philippines as well.
I got mine replaced 2 weeks ago and the service center do acknowledge this issue. However, my unit was not out of warranty so I'm not sure if our country honour the global procedure. I would say give it a try and tell the service center front desk ppl about this. They may have special memo for this rare issue and insist then to check with their higher management for it. This is a known issue globally and can easily Google for evidence.