Disconnect terminals while charging with battery minder?

There are a number of Battery Minder/Tender (Two different brands of same subject) The one I bought last Halloween can hit 70 amps in jump start mode, 20 amps in bulk mode or I think 3 or 4 in float mode.. I really needed that 20 amps.

The answer is no, you don't need to disconnect (except in teh 70 amp mode) and most of 'em can't do 70 amps.

I wanted a really good smart charger.> That's why I got the one I got. Store did not have anything else that looked as good. More expensive yes. as good no.