Trickle charger

Attempts by Waterloo signalmen to clear the points by power operation eventually exhausted point motor batteries, which are fed by trickle chargers, and a blown fuse accentuated the problem; thus, even when the points had been cleared of ice, no power was available to operate them until the batteries were sufficiently recharged.

She hooked the truck battery up to the trickle charger and left it.

A trickle charger is particularly useful for batteries which have to be kept out of use temporarily or for standby batteries which are used only in emergencies.