I am looking into getting one of these to try to save several batterys
that are new but were stored to long without a charge such as the ``jump
start`` devices used to start cars and of coarse other used batterys .

I have been searching on the net for one that simply plugs into 120
volts for use inside . Most of them i see hook to 12 volts and stay in a
vehicle . Some 120 volt ones cost 500$ . I am looking for one around
100$ .

What can anyone say about these .