Posted by jdemaris on December 11, 2009 at 10:54:08 from (67.142.130.39):
In Reply to: Battery Tenders posted by Dellbertt on December 11, 2009 at 05:39:11:
I've been using them for years. And yes, they do a great job of extending battery life on any equipment that spends a lot of time sitting.
I've got a place in Michigan, 1000 miles from my home with a diesel Ford truck and four tractors. That's 10 batteries that would be sitting around suphating if I did't have tenders on them.
At home, I've gove four cars, two diesel trucks, four diesel crawlers, five diesel tractors, and three diesel backhoes. That's a lot of batteries. I use tenders on all the ones that don't get used much.
Note I've got some high-price Schumacher, Iota and Vector units and some very cheap Harbor Freight. All have worked flawlessly.
The Harbor Freight cost only $14 each and come with steel brackets for on-vehicle mounting. They are a bargain and anyone that claims they can burn your shop down is being a bit silly. They are UL listed and safely wired. The worst that can happen is, that a $14 unit might actually stop working. Not exactly a big loss. So far, the only one that's gone bad on me is the most expensive Schumacher.
I'll add they use very little power to keep plugged in. They are INDEED battery chargers, but only capable of 1.5 to 2 amps max. They first overvolt the battery to 14.8 volts. Then turn off, and only come back one when voltage drops below 13.5 volts.
Only problem you have to watch for is hooking to too many batteries. One little 1.5 amp charger can be hooked to a large pair of batteries - but no more then that. Otherwise, it will never shut off because it cannot get them above 14.8 volts.
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