came across this and picked one up the other day for $16.  I have generally
found the items Aldi gets on their "special buys" to be of pretty high
quality, especially for the price.  Below is a link to a google search that
should get you more info on it.  There's a link there to the manual if you
want to read it.  It has a couple different modes, can do 6v as well as
12v.  claims to be able to revive a deeply discharged 12v battery.  tapers
to lower amperage as battery gets close to full and switches to trickle
when charge is done.

https://www.google.com/search?q=cpl-2054u&ie=utf-8&oe=utf-8#q=cpl-2054u+battery+charger

Edward