This useful, but out-of-focus, little production explains how to switch out the battery on your old SNES RPGs. When you think about it, you can’t really expect a little watch battery to hold a charge for 15 years. So if you buy a used copy of Chrono Trigger or Final Fantasy III (and please do so), there’s a risk that its little battery is going to croak. Like the NES’ 72-pin connector, you can get a replacement at Radio Shack or Frye’s and fix it yourself — if you’re willing to crack that sucker open.