Old 03-20-12, 06:58 PM
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I hooked up a sealed car battery to a Noco 3500 charger. I thought it would be half dead but
went to 3/4 right away and was fully charged within 15 min. Is this a bad sign.???
whats a good way to test it outside of the truck.???
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Old 03-20-12, 07:13 PM
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Buy one of these Schumacher BT-100 Battery Load Tester
It puts a load on the battery via a resistive coil. If the battery is good it will tell you.
Old 03-20-12, 08:09 PM
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OTC 3182 130-Amp Digital Battery Load Tester

this one looks good too,no?? shumacher makes cheap stuff unfortunately
Old 03-21-12, 04:32 AM
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I bought a cheap one from harbor freight about 25 yrs ago and it still works great. They aren't overly complicated and no more than they cost today, I wouldn't be afraid of any brand.
I always thought Shumacker was a good brand
Old 03-24-12, 10:13 PM
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If you do not wish to buy a load tester, most auto parts stores will test it for you free, at least in my area they will.
Old 04-03-12, 08:11 AM
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sealed batt

I read somewhere that you cant charge a sealed batt in the normal way. You have to hook up another batt or something????
Old 04-03-12, 06:39 PM
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The make and model of the batery might help.

Hooking up batteries to charge sealed ones is not needed.
What this refers to is if you have a stone dead battery of any type, automatic chargers will not begin charging until they sense voltage.
If you wind up with a battery that will not trigger a charger the voltage will be quite a bit less that 10 volts.
The battery will be pretty much be damaged beyond having any kind of useful life when the voltage is allowed go that low.

We really don't know what kind of sealed batteries 99gas is talking about.
Some people refer to low maintenance auto batteries as sealed because they have tape or hidden caps on them.

That charger appears to have a 3 1/2 amp charge rate.
If you are referring to a near dead car battery and it charges fully with 3 1/2 amps in a short period of time then yes, it is most likely finished.

If you look closely you may find a way to pry the caps off.
You can check the water level and get a hygrometer for a couple of bucks to check each cell.
Old 06-06-12, 08:25 AM
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You might just need a new battery.

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