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Tool Talk Discussion Forum

New sears diehard battery charger

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Randy in Pa

01-24-2007 19:46:50




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Hello everyone. I just bought a new sears diehard battery charger, micro processor controlled with battery and alternator tester plus engine start 2/12/30/80. Was about $69.00

Now the instructions say (never) connect the charger to the negative terminal on the battery with no explanation as to why not. They want you to connect to a frame part connected to the battery, or if you have the battery out they want you to connect a 2 ft lead to the battery then connect the charger to the lead. This seems really strange to me as we have connected chargers to both terminals all my life. Any ideas as to why they want me to do this?

And they did not say anything about disconnecting the positive terminal from the vehicle before connecting the charger to the positive. So I guess that it is OK to leave the battery hooked up to the vehicle while charging it?

Thanks!

Randy in PA

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djm75

01-27-2007 04:39:08




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 Re: New sears diehard battery charger in reply to Randy in Pa, 01-24-2007 19:46:50  
The reason is your suppose to hook the pos up first then when you hook the neg you complete the circuit and there could be a spark and if a batt is run down and hot the gases from it could make it explode happened to many people I know thats also why your not suppose to smoke.



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dan hill

01-26-2007 05:39:36




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 Re: New sears diehard battery charger in reply to Randy in Pa, 01-24-2007 19:46:50  
Ive found that chargers that shut down on their own dont fully charge a battery.Check the battery with a hydrometer after the charger shuts down.You will get a half charged reading.Batteries take on a surface charge quickly, long before they are fully charged.My friend just bought one of these new chargers, he felt it wasnt doing a good job.I tried it on my saw mill battery and found that the charger shut down when the battery was only half charged.

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Randy in PA

01-26-2007 05:44:22




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 Re: New sears diehard battery charger in reply to dan hill, 01-26-2007 05:39:36  
IT did seem like my battery's charged awful quick yesterday. Thanks for the tip.

I will check the ripple thing too.



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supergrumpy

01-25-2007 12:20:30




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 Re: New sears diehard battery charger in reply to Randy in Pa, 01-24-2007 19:46:50  
ripple voltage

some battery chargers have high a/c voltage running on top of the DC charging the battery, to check yours out put your battery on the charger and then check voltage across the battery in a/c position, I have seen 40 volts on some cheap chargers

this ripple a/c can maybe possibly sometimes pop your alternator diodes or toast the electronics, was told that at Morrisville in 1972, don't know if its true but didn't want to chance it

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lucasss

01-25-2007 06:30:36




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 Re: New sears diehard battery charger in reply to Randy in Pa, 01-24-2007 19:46:50  
we allways disconect a battery cable before charging on these new cars.to much sensitive electronics on cars nowadays.. if you leave the charger off when hooking up you can hook it directly to the battery. too many guys hooking them up with charger on ,making a spark.makes you wonder dont it..lucas



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Randy in PA

01-25-2007 07:55:33




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 Re: New sears diehard battery charger in reply to lucasss, 01-25-2007 06:30:36  
That makes sense. I just went around and charged all the battery's on the place. I didnt bother to disconnect anything. I will next time though.

3 tractors a van and a car that sit around a lot. With the cold weather we are experiencing A battery charger is about the same cost of a new battery these days.



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Dannie

01-25-2007 02:32:33




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 Re: New sears diehard battery charger in reply to Randy in Pa, 01-24-2007 19:46:50  
Do not want to blow battery.



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Rockyhawaii

01-24-2007 20:39:29




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 Re: New sears diehard battery charger in reply to Randy in Pa, 01-24-2007 19:46:50  
I think it's a liability issue in the sue-happy population. Sears wants to avoid a suit if a spark explodes a battery.



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Bob

01-24-2007 19:50:24




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 Re: New sears diehard battery charger in reply to Randy in Pa, 01-24-2007 19:46:50  
By making the ground connection LAST, to a point on the chassis, away from the battery, you lessen the chance of a battery explosion.



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Randy in PA

01-25-2007 05:23:23




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 Re: New sears diehard battery charger in reply to Bob, 01-24-2007 19:50:24  
That is what I figured.

Now does the battery need unhooked from the vehicle before charging now days?

Thanks!



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glennster

01-25-2007 08:27:06




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 Re: New sears diehard battery charger in reply to Randy in PA, 01-25-2007 05:23:23  
the problem i see with disconnecting the battery in a new vehicle to charge is the computer may dump its memeory, or if it has an anti theft radio, it will de-activate and you must enter a code to get the radio to work again. honda's are notorious for this. they make a little deal that plugs in to the cigarette lighter that you hook a 9 volt battery to to keep power supplied to the ecm's and radios. i dont see a problem with leaving the battery hooked up.

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