Gear iconx replacement battery

I have a brand new set of Samsung Gear IconX Headphones and the left earbud has a battery life somewhere around 15-30 minutes. The right runs as per the specs. I don't have a proof of purchase, so even though they are new and still within the warranty period, I can't send them to Samsung for repair or replacement and Samsung does not sell the battery.

I've been looking, unsuccessfully, for a replacement battery, so I could try to swap out the battery myself.

Does anyone know where to get a replacement battery?

Has anyone successfully done the repair?

Thanks.

So, I went ahead and opened up the left earbud and it actually was surprisingly easy. The battery in it is a "Varta Cp1254 A2". It is a 50mah version, but Varta makes an "A3" version that is identical except that it is 60mah, so that seems like a logical upgrade. The only problem so far is that these batteries are pretty difficult to find without ordering in bulk from China. While I would definitely like to find 4 A3's, I have no use or budget for a minimum order of 1000. If anyone has any or can hook me up with a vendor, I'd definitely be interested in buying at least 4 of them. Thanks.