These units are in very good condition. I have used them about 30 times.
The Prolong ‘Discharge Ready’ Battery Charger is preventative maintenance for batteries that are beginning to show early signs of deterioration. This version of our systems are compatible with the Prolong Battery Dischargers. Many of our customers opt to perform in-car battery reconditioning as their batteries age, which requires both a charger and a discharger. The Discharge Ready option allows for easy ‘Plug-and-play’ addition of a Prolong Discharger later.