It has seen extreme cold and heat and so far done a great job.

This unit does a fine job at it's primary mission.

The multiple stage charging system does a great job and it really tops the batteries off nicely

Works great.does the job

The Battery Tender does a great job of keeping the batteries exercised and full of quality power

Does a good job on may large cranking battery for may class A motor home

It has worked perfectly and does an excellent job charging and keeping a charge on this when not in use.

The multiple stage charging system does a great job and it really tops the batteries off nicely

It looks like it's doing the job ok