Deltran is the vendor for the Battery Tender, I believe they own the name as it is splashed all over their unit (The regular and the junior model).

See Deltran link for reference:

Battery Tender - Home of the Battery Tender Jr. - Batterytender.com

Whatever unit you end up with, as stated above, make sure it switches to a float charge after battery reaches full power, or you will cook the battery (and it ain't a pretty sight)...