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Old 07-06-2005, 07:52 PM   #1
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Default Batteries Questions

What does amps on batteries mean.. and what does [email protected] seconds mean... i dont know anything about them
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Old 07-06-2005, 07:59 PM   #2
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1.17 is the average discharge voltage per cell over 600 secs @ 20 or 30A
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Old 07-06-2005, 08:38 PM   #3
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so what does amps mean

and what does the seconds mean..

i didnt really get what u were saying thanks
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Old 07-06-2005, 08:56 PM   #4
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Amps is a unit of current flow.
Seconds is time therefore:

In your 1st post you said 1.177v, 600sec.

This means when discharged at 20 or 30amps the cell maintained an average output voltage of 1.177 volts for 600seconds( 10 minute )

The best analogy I can think of is a water hose.

It has pressure ( think volts ). when you turn the tap on it has flow (amps)

The more pressure it has(volts) the more flow(amps) you will get thru a set hose size.

ummm maybe someone can help out here
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Old 07-06-2005, 10:13 PM   #5
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Doin' good, bud! The hole in the bucket analogy will have to wait!
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Old 07-07-2005, 01:49 PM   #6
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so would a more second battery last longer or a lower second?? the one i showed u outputs 1.177 volts when running an rc car??? how can that be...

30 amp 1.146 @ 409 sec is 1.146 output and only lasts 409 seconds...

how can the 1.177 last longer??
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Old 07-07-2005, 01:55 PM   #7
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Alright, here this is explained, hopefully a little easier.

If a battery is discharged at say 30 amps, what a matcher does is cherge the cell individually and then discharge it at 30 amps, from looking at the numbers you are posting. So, with a 30 amp load, that one cell will run for x amount of time until the voltage reaches the cutoff(usually .90 volt) and so over that entire discharge, the average voltage of that cell was 1.177 or whatever. When you see batteries advertised I know it says 400 something sec at 1. whatever volts. That is for one cell. When you add all six together you get the 7.2 needed to run an r/c car.

Easy reference: more seconds means more runtime and higher voltage is more power and lower internal resistance means more punch.
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Old 07-07-2005, 02:26 PM   #8
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ProMatch GP 3300 (30 amp) 1.146 @ 409 sec
Litespeed Sanyo 3300 (20 amp) 1.177 @ 605 sec

which one would last longer and which one would have more energy
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Old 07-07-2005, 03:20 PM   #9
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Thats a bit tricky to answer because they were discharged at different amperages .

If you ignore the effects of internal resistance i am guessing they will come out roughly the same given the same load.

Now having said that I think I would go with the promatch cell as the gp is a better battery than the sanyo (my opinion ) for two reasons:

1. the promatch batt was discharged at 30a so you get an industry std measurement
2. I just dont like sanyo's

Now if you have both packs you could do a little test to determine the better pack.

Make up a bulb discharger capable of 30A discharge.(or put it on a 0-30 discharger or similar)

And measure the output voltage of the cells while under load.
This will show which has the least internal resistance .You could also measure the time until the lights go out to compare runtime.

One more thing, these tests are not accurate to the nth degree but for someone without access to sophisicated equipment will give you a reasonable comparison between the two packs.
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