PewPewPew
Newly Enlightened
If you have a newer car that has the tire pressure management system, you can successfully remove the silicone or epoxy potting from them and solder on some new batteries. I use a dremel with a small dulled burr to remove the epoxy. It doesn't matter if you scuff up the old battery, since you're throwing it away. Read the old numbers off of the battery to re-order. You'll can buy the ones that have the tabs pre spot welded on, or you can scuff up the new battery with emery cloth in order for the solder to stick to it and re use the tabs that are still attached to the board. Thinned out silicone with mineral spirits is pour-able and self leveling for when you want to seal it back in. Here's a video on how to thin it out.