Harbor Freight $7.99 float chargers:

You don't say! Have you ever measured their voltage? Or is it written
on the case?

I never had, so I went out (to the garage; brrrr!) and measured one:
13.58 volts. FWIW, the wallwart says "15VAC at 600 ma", but there's a
little plastic box on the wires between the wart and the battery clips.

--Myron.
--
Five boxes preserve our freedoms: soap, ballot, witness, jury, and cartridge
PhD EE (retired). "Barbershop" tenor. CDL(PTX). W0PBV. (785) 539-4448
NRA Life Member and Certified Instructor (Home Firearm Safety, Rifle, Pistol)