The battery tenders work great if you don't do what I just did.
Went to start the Manta this morning after it had sat for about a week
on the tender and it was about flat. Looking around to see if something
was amiss, I discovered I had accidently bumped the 6V/12V switch on the
tender to 6V. Doh!
Looks like the battery will be okay at least.
Btw. Both my tenders are Sear Craftsman.