Review on Efficient 12 Volt Automatic Battery Float Trickle Charger by Cen-Tech - A Reliable Power Solution by Douglas Holla

I wish I'd taken a closer look at the equipment. I have purchased the same units from Harbor Freight and they have not had a good experience with them. They don't hold a battery. I've had a Battery Tender on a truck battery for a few months and every time I went there it was at 13.8v and it started right away. Last week I removed the Battery Tender and turned on the Cen-Tech and today the batteries are dead. They end up in the garbage and I pay extra for the battery tenders.