On 5/21/2013 7:31 AM, HeyBub wrote:

This on-off-on-off sequencing prevents over charging, which will boil off
the electrolyte and under-charging which causes shorted cells due to
sulphation. A Float Charger may remain connected to a battery indefinitely.

Here's one for less than ten bucks:
http://www.harborfreight.com/battery-float-charger-automatic-69594.html

Here's another (I don't know the difference)
http://www.harborfreight.com/battery-float-charger-automatic-69594.html


Uh, detecting the difference may be extremely difficult (other than to
say, "this is one, and this is another one [of the same thing]"

You seem to have posted the same link twice.g

These do work, however. I have used one of these for a couple of years
now to keep the battery topped off on my standby generator. Probably
got it for $6 or $7 while on sale.