I gave up on using the ‘coin’ batteries in my SmartThings motion and multipurpose sensors over a year ago due to the coin batteries needing to be replaced every 1-2 months (what a pain) using the old SmartThings pre-Edge DTH driver. I converted my sensors from the 3v coin battery over to using dual AAA battery packs which are 3v thanks to @jlv. I now rarely have to change batteries in my sensors since the dual AAA batteries last almost a year or so now.