[The Master Cylinder]

I bought a Schumacher when I read a similar thread on Ford Barn a couple of years ago and I thought I would try one, even tho I have always used Deltran battery Tenders in the past with no problems. Glad I only bought one. It only lasted ~6 months. One of the Battery tenders I have had for over ten years. I have 4 Battery tenders now of different sizes.