Does anyone know a source for PRAM batteries for the Pismo or Lombard? My Pismo is working very nicely with a new SSD replacing the noisy HD, but the PRAM battery won't retain the date/time. I can't find a replacement at the usual suspects (eBay, Amazon, NewerTech, etc.), and I don't have the skills to build a new one. Any information will be gratefully received.