After keeping a few for myself I have five of these available.
They are the same dimensions as standard Vexilar batteries. They are used and are from uninterruptable power supply units for PC modems I believe. I charged them all up, put a meter on them several days later and all read between 13.5 and 15+ volts so they are holding a charge nicely. I hated to put the wear and tear on my locator, but I further tested each one by having it run my Vexilar for an 8 hour straight test. After 8 hours, my Vexilar's battery charge LED stayed in the 100% (complete charge) range so the batteries should be fine.
$10 each, price firm, pickup only in Streamwood, no warrantees as they are used, but all tested by me. Please, not a ton of PM questions. If I sell all 5 and get $50 this was hardly worth my time. Just trying to be helpful to anyone who needs some replacements or spares. Maybe I'll get lucky and find one person to take all of them.