Yeah, I currently have 3 cars, so its pretty often atleast one of them doesn't get driven for a while, so batteries need charging!
 
Think I'll order one today then!

Ordered one for $93 delivered. Seems like a good price. Will let you guys know how it goes!

Newer chargers need to sense some voltage or they won't turn on if the battery is below a certain voltage dependant on which charger you have. You can however get a zero volt charger which will charge a flat battery from almost zero volts provided the battery is otherwise in good condition.

I too use a battery fighter as I one drive my car about once every few weeks to a month. These are great as they're around 750ma which is a much healthier way of maintenance charging a battery rather than 6 amp (or whatever) switching between a float and bulk charge all week long.

Best way I can explain is 3 meals a day for a week vs a week's worth of food in a day.

As a little side track to this thread, I've had the issue of a "dead flat" battery and the high tech charger not seeing it.  Solution - use a second battery (actually a 12V power supply), jumper cabled in parallel with the "corpse" momentarily to fool the charger into starting.  Once it's charging remove the jumper source.

Too bad if you don't have another battery handy lol.
I believe that it is a safety feature for many charger's to need to see a voltage before they will charge.
 
 

haha and I've been wondering why my charger does not spark when touching the ends together but still charges. Makes sense now

I use a little 12v battery from a central locking remote with some wires soldered on, small and easy to trick a charger into starting a charger on a dead flat battery.