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Charging Technique

Charging Technique

Old 07-19-2004, 11:47 AM
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Default Charging Technique

I am back into Electric from a long time away so. I have some brand spanikin new smc 3300 batts and a pulsar charger. I have heard that charging the 3300s at 8 amps is good for high voltage but a little worried about heat charging at this rate. Should I charge the cells at 5amps an then re peak at 8amps. THANKS!
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Old 07-19-2004, 11:49 AM
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I've been told to not charge nimh batteries at more than 3 amps. Nimh batteries should not get hot.
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Old 07-19-2004, 12:36 PM
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not over 3 amps??????????????????

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Old 07-19-2004, 12:55 PM
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Surge Battery Matching has a good FAQ about charging GP3300 ni-mh batteries.

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Old 07-19-2004, 12:59 PM
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the higher you charge them the better they may go in the short term, you will shorten the life of them, i've been told to charge at 5/6 amps and peak them at 7 amps,

but people will always have different ways of chargingbut this works for me,

my $0.02 worth

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Old 07-19-2004, 01:21 PM
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I just charge them at 5.0amps with .05 peak detect then if pack isn't very warm or has sa for more then 15minutes I'll repeak before the race.
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Old 07-19-2004, 01:35 PM
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I charge my 3300 5 amps then when your race starts to begin I bump my batteries like 7-8 amps for like 30 to 45 secs. So it will have some punch during the race. and make sure you dont over heat the cells!
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Old 07-19-2004, 01:40 PM
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For stock, charge at 6 amps.
For mod, charge at 5 amps.

Use .05 delta for average room temp. If you are outdoors and its hot (80+f), go with .03 If its very cold, go .07

It is important for the pack to be "WARM" but not "HOT". The cells being warm decreases the IR because the chemical reaction happens quicker inside of the cell, releasing more energy over a shorter period of time (car goes faster)

7 amps will give a slight increase in voltage, and as long as you don't overcharge, it "MAY" not significantly reduce the life of the pack, but I don't like to chance my money like that.

If your going to do high amperage charge, set you delta peak at its minimum. At that rate, they can go from warm to way too hot in a hurry.
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Old 07-19-2004, 03:08 PM
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NICE! thanks guys very helpfull!
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Old 07-19-2004, 06:10 PM
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i charge at 6 for club meets, 6.5 for big race events,
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Old 07-19-2004, 06:31 PM
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you bought a new SMC pack yet you failed to go to there web site for charging and caring info? WOW! 6 amps for stock and 19 turn 5 amps for bashing and mod racing..danny (smc) likes to get the batts around 140 deg before hitting the track! use the net to your advantage grasshopper!
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Old 07-19-2004, 06:48 PM
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katfish why didnt you tell them you charge at 10 amps!
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Old 07-19-2004, 06:49 PM
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Originally posted by TC3xRacer
I've been told to not charge nimh batteries at more than 3 amps. Nimh batteries should not get hot.
you were told wrong. follow the directions your battery matcher gives.
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