when should a powermax pm4b drop into float mode

here's an even better deal on the gophert cps-1620:

http://www.aliexpress.com/store/product/Mini-Precision-Compact-Digital-Adjustable-Switching-DC-Power-Supply-OVP-OCP-OTP-low-power-16V-20A/612308_2031261463.html

i paid $85 + $30 shipping,so $5 cheaper.

i confirmed with the manufacturer that it runs on both 110v and 220v.

...and it has constant volts and constant amps, so great for locking in those amps during Eq. it can also be used as a 6v charger for eq'ing individual batts. :)