Thanks for sharing your S rechargeable experience, @anon66854306! The day we figure out how/where to source these S batteries is when I’ll start considering upgrading my current OPN 1 with a pair of OPN S1 R by buying from eBay via the DIY route. Otherwise I’d be sol if the batteries go bad and I don’t have anywhere to source it. By then, hopefully the used or third party market for the S1 R on eBay will make them become more available and affordable to choose from.