Batteries for Samsung SSG3300GR glasses

Sorry if this is the wrong place but does anyone have any experience changing the batteries in Samsung SSG3300GR. Amazon has them for 20.99 a pair but there were quite a few reviews saying the battery's were already gone on some of them. I got them to try and of course one was completely dead and won't charged. I figured it would be easy to find batteries to replace them. I wasn't worried about having to solder in another one as I have soldering experience. The glasses require a 3.7v 70mah battery. Seems to be hard to find the size I need. I'm hoping someone else has experience with these. I wasn't looking to spend a ton of money on 3D as I have had this tv for a while and would like to get a 4K set down the line so I figured these would be an ok price to get started.