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6/25/13 2:14pm - Original Message: 'Battery charging rate 2-10-or 50 amps.'
eldredjames Lifetime Member
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Temple City, CA - USA

Vette(s):
1969 Daytona Yellow. 350 / Automatic.

Joined: 10/3/2010
Posts: 361
OK, my battery is dead again.  Attributed this time to the damn horn and a stuck hazard flasher and laziness to disconnect the battery.  I thought it would be alright this time.

I bought a new charger from China that charges at 2, 10, and 50 amps.  Will 50 amps ruin the battery?  I seem to remember auto lore from my days as a young lad to that effect.  But I'd sure like to charge it up quickly!

Jim

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6/25/13 3:40pm - Reply: 'Re: Battery charging rate 2-10-or 50 amps.'
eldredjames Lifetime Member
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Temple City, CA - USA

Vette(s):
1969 Daytona Yellow. 350 / Automatic.

Joined: 10/3/2010
Posts: 361
I got my answer on the Corvette Forum.  Thanks.

Anyone finding this post: my best bet is 10 amps.  2 amps is a trickle charge and will take forever, 50 may damage the battery.  I'm looking at an all night charge to do it right.

Jim


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6/25/13 4:19pm - Reply: 'Re: Battery charging rate 2-10-or 50 amps.'
rraider1
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Woodland, WA - USA

Vette(s):
1977 T-Top,350,Auto Black Ruby Pearl,Steeroids R&P conversion

Joined: 10/14/2003
Posts: 1152
Keep in mind you probably have a 60 amp alternator I believe the main choice is based on the time you would need it. If you come out to drive, find the car dead you would use the 50 amp setting to get going as soon as possible alt would finish charge just the same as if you could push start. many fast charges from a dead state would reduce the life of the battery, if overnight is ok 10 amp would be easier on the battery plates. 2 amp would be best and can be used to keep it charged.
2 more Cents Lamp  

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Bob R
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6/26/13 12:08pm - Reply: 'Re: Battery charging rate 2-10-or 50 amps.'
Adams' Apple Lifetime Member
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Duncanville, TX - USA

Vette(s):
#1-1974 L-48 4spd Cp Med Red Metallic/Black deluxe int w/AC/tilt/tele./p/w-p/b/ Am-Fm/map light National/Regional/Chapter NCRS "Top Flight" #2-1985 Bright Red/Carmine Cp.L-98/auto Member: NCRS, NCRS Texas, Corvette Legends of Texas

Joined: 11/8/2003
Posts: 19459
Handshake I respectfully will disagree....NEVER use the 50 amp setting for anything other than a "boost" after charging it for at least an hour at the lower settings. Charging at 50 amps can damage the battery. Just because the alternator puts out 50-60 amps doesn't meant it does it all the time, as a charger does. An alternator charges as needed....a charger is full time ON.
With a dead battery from leaving the lights on, or similar deal, charge it at the 10 amp setting for an hour....that will usually get it up to enough voltage to start the car. If not, but almost, charge again for an hour, then put it on the 50 amp setting and crank it. As soon as it starts, be sure to disconnect the charger.
Also, on some vehicles with electronics, charging a dead battery at a high amp rating can damage electronic components.
If ya gotta get it running asap, use jumper cables, or a booster box. Thumbs Up

|UPDATED|6/26/2013 10:08:35 AM (AZT)|/UPDATED|


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Joel Adams
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6/26/13 5:47pm - Reply: 'Re: Battery charging rate 2-10-or 50 amps.'
eldredjames Lifetime Member
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Temple City, CA - USA

Vette(s):
1969 Daytona Yellow. 350 / Automatic.

Joined: 10/3/2010
Posts: 361
Thanks guys.  I charged it for a few hours at 10 amps but now it too hot out in the garage and so cool in here.  I'll wait til icools off a bit and give it a try.

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6/26/13 6:10pm - Reply: 'Re: Battery charging rate 2-10-or 50 amps.'
tb2k82ce Lifetime Member
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Lemon Grove, CA - USA

Vette(s):
1982 C3 Collectors Edition 44000 miles, sat in the sun most of it's life, My wife purchased it for me for fathers day in 2007 from her girl friend that had it for 19 years. It is on the road again. I'm retired but it is now my daily driver.

Joined: 10/17/2007
Posts: 2007
My charger has the same setting and reading everything that came with it (which I normally do not do).  It does caution use of 50 amp setting for liquid batteries.  Gel cells and another type I have never heard of it say 50 amp is ok but not recommended for long periods of time.  

Basically the 50 amp setting is to let you crank the car over using the charger.  2 amp is for small batteries it says but of course could be used to keep the battery topped off.


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6/26/13 7:09pm - Reply: 'Re: Battery charging rate 2-10-or 50 amps.'
stingrayjim jr Lifetime Member
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SHELBYVILLE, TN - USA

Vette(s):
1976 L48 auto

1978 L82 4speed

1994 LT1 6speed

Joined: 7/5/2002
Posts: 3937
For those who enjoyed the "Cars" movie(animated one), or for those that live the lifestyle of the california cruisers,  "Low and slow" is the motto for charging a battery... :)
 
Would agree with Joel, do not use the 50 amp setting for anything other than 'boosting' the battery to start the engine.  Prolong use of that setting will damage the battery.  The 2 amp setting is really the best setting if time is not an issue.. so, that leaves us with the 10 amp, which is perfectly ok too, withing a 18 hour period.  We, at the warehouse, charge 20 batteries at a time, usually 18 to 24 hours at about 5 to 7 amps, the amps drop over time, to around 2-ish.  Straight out 2 amp charging you would probably need 24 to 48 hours at least, depending on the severity of discharge. 


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StingrayJim
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6/27/13 10:17am - Reply: 'Re: Battery charging rate 2-10-or 50 amps.'
rraider1
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Woodland, WA - USA

Vette(s):
1977 T-Top,350,Auto Black Ruby Pearl,Steeroids R&P conversion

Joined: 10/14/2003
Posts: 1152
Better clarification Thumbs Up 

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Bob R
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