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Old 11-23-2002, 11:25 AM   #76
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Quote:
Originally posted by unknown

What if I get a 1800 mAh pack. Will that offer me less run time...? Or less power?
mAh = miliamp/hours. Which means run time. If you want to get packs that have more voltage, look for the team level matched packs. They have the most, followed by racer, club, and then all the unmatched packs. The matched packs also have slightly better run time.
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Old 11-25-2002, 02:28 AM   #77
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Default Re: Re: Charge times

Quote:
Originally posted by marvi
im not sure if this is the correct formula but here goes:
charge time (in seconds) divided by 3600. then multiply by the amp rate

for example, charge time is 1500 seconds and rate is 6 amps.
1500/3600 = .4167
.4167 x 6000 = 2500mah

i think this is the same value shown in the first gen. millenium after the end of each charge.
You made it look complicated with those seconds conversion


We could simplify the above by putting it into and equation. Also, Nicads are fully charged up to 140% of their rated capacity. NiMHs are charge up to 150% of their rated capacity.

So for Nickel Cadmiums:

Charging Time (Hours) = 1.4*Rated Capacity(mAH)/Charging Current(Ampere)
Charging Current(Ampere) = 1.4* Rated Capacity / Charging Time

for Nickel Metal Hydrides:

Charging Time (Hours) = 1.5*Rated Capacity(mAH)/Charging Current(Ampere)
Charging Current(Ampere) = 1.5* Rated Capacity / Charging Time



This is according to a literature accompanying a Charger design I found in a local electronics magazine. In the absence of a peak detect charger, I usually follow the formula for Nicads, but for NiMH, only charge up to 100% of the rated capacity. No 40% over charge...
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Old 11-25-2002, 03:34 AM   #78
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sorry, i got used to that formula
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Old 11-25-2002, 05:15 AM   #79
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mAh = milliampere * hour, which means stored energy.
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Old 11-25-2002, 06:30 AM   #80
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Default oops

Quote:
Originally posted by JesseT
mAh = milliampere * hour, which means stored energy.
Sorry should have read:

For Nickel Cadmiums:

Charging Time (Hours) = 1.4*Rated Capacity(mAH)/Charging Current(milliAmpere)
Charging Current(milliAmpere) = 1.4* Rated Capacity / Charging Time

for Nickel Metal Hydrides:

Charging Time (Hours) = 1.5*Rated Capacity(mAH)/Charging Current(milliAmpere)
Charging Current(milliAmpere) = 1.5* Rated Capacity / Charging Time


Thanks JesseT
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Old 11-25-2002, 09:32 AM   #81
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Shoot, everyone is making things complicated -

rule of thumb is - lower the mAh rating, the more punch, the less run time, the higher the rating, the less punch, the more run time.

Nobody can argue that 3000's have as much punch as a set of 1400's. . .

And it's a rule of thumb. . .
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