ProMariner 44021 ProSport HD Series USA Battery Charger, 20 Amps, 3 Bank. Handrail This is called the stroke

This is called the stroke of the gas spring

sealed pressure switch for on-demand operation

eliminating the possibility of line-fouling and water intrusion through the side plate

Some chargers don't put out the amps they say they do

With its convenient design

ProMariner 44021 ProSport HD Series USA Battery Charger, 20 Amps, 3 Bank. Handrail This is called the strokeProMariner 44021 ProSport HD Series USA Battery Charger, 20 Amps, 3 Bank. Features a lightweight, tri surface heatsink design. This delivers significantly faster charging through optimal cooling, while delivering true rated constant current charging amps during charge mode. Fully automatic multi stage charging enhances battery performance while extending battery life. USA 120V AC INPUT