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View Full Version : 2100mah nicd VS 3000mah nimh how much more runtime?



Gary777
09-27-2002, 10:23 PM
Newbie here. Still waiting for my MRC truck to arrive from Ebay. (taking awhile)

Just researching batteries and chargers.

2100mah nicad VS 3000mah nimh... how much more runtime will I get from the 3000's?

And what is a decent but inexpensive charger that will charge both 2100 nicads and 3000 nimh's?

Thanks!

Crashmaxx
09-27-2002, 10:30 PM
The 3000s will last a lot longer. For 2 reasons,
1. It has more milllamp hours(duh)
2.It dumps slower as in, it will give slightly less voltage for a longer time rather then a lot at first and getting worse and worse(good for racing though).

But they will be more expensive, take less abuse and need a more expensive chager, but I have some good 3000s and they are awsome.:D

k_sw31
09-27-2002, 11:25 PM
good charger- mrc super brain

BTW, try posting this in the electric forum

Gary777
09-28-2002, 12:11 AM
oops, good point, thanks.


Originally posted by k_sw31
good charger- mrc super brain

BTW, try posting this in the electric forum

Crazy Canuck
09-28-2002, 08:50 AM
Logically, the 3000s will last (3000/2100)=~50% longer.

Heavy Throttle
09-28-2002, 10:20 AM
Your 2100 mah nicad is only 2.1 amps. While the 3000 mah nimh is 3.0 amps. Just an increase of power while both batteries still contain 1.2 volts per cell and both still equal to 7.2 volts. So in reality they will last the same ammount of time. The 3000's will have alot more punch, and since it's nimh chemistry they will have a larger power band as to where the nicads power seems to drop off right away. This is where, they seem to last longer since you still have alot of punch throught out your run, but it's the batteries chemistry that allows this.

You can pick up a Pro-Match Matched 3000HV for around 54$. They are the battery choice I use and have been way more than happy with them.

You need a peak charger that can charge nimh cells. I use an Integy Pro2.5. You want to find a charger that will allow you to charge at least twice the amps of the battery. In this case since your looking for 3000's, get one that can do a 6 amp charge. On the other hand, most matched packs state to charge them at 5.0 amps. Just depends on the manufacture.

Other thing is that nimh peak on temperature. Keep your battery in front of a fan to keep it cooler, and you will get better battery life and a better charge. Heat is the worst issue on packs. Some people at the track actually charge there nimh packs inside a cold cooler, that is a bit extreme, but they come out screaming during the race. I just use a fan and do just as well.

Gary777
09-28-2002, 11:02 AM
I'm going to order an MRC Super Brain, will this work ok?


Originally posted by Heavy Throttle
Your 2100 mah nicad is only 2.1 amps. While the 3000 mah nimh is 3.0 amps. Just an increase of power while both batteries still contain 1.2 volts per cell and both still equal to 7.2 volts. So in reality they will last the same ammount of time. The 3000's will have alot more punch, and since it's nimh chemistry they will have a larger power band as to where the nicads power seems to drop off right away. This is where, they seem to last longer since you still have alot of punch throught out your run, but it's the batteries chemistry that allows this.

You can pick up a Pro-Match Matched 3000HV for around 54$. They are the battery choice I use and have been way more than happy with them.

You need a peak charger that can charge nimh cells. I use an Integy Pro2.5. You want to find a charger that will allow you to charge at least twice the amps of the battery. In this case since your looking for 3000's, get one that can do a 6 amp charge. On the other hand, most matched packs state to charge them at 5.0 amps. Just depends on the manufacture.

Other thing is that nimh peak on temperature. Keep your battery in front of a fan to keep it cooler, and you will get better battery life and a better charge. Heat is the worst issue on packs. Some people at the track actually charge there nimh packs inside a cold cooler, that is a bit extreme, but they come out screaming during the race. I just use a fan and do just as well.

sosidge
09-28-2002, 11:44 AM
Originally posted by Heavy Throttle
Your 2100 mah nicad is only 2.1 amps. While the 3000 mah nimh is 3.0 amps. Just an increase of power while both batteries still contain 1.2 volts per cell and both still equal to 7.2 volts. So in reality they will last the same ammount of time. The 3000's will have alot more punch, and since it's nimh chemistry they will have a larger power band as to where the nicads power seems to drop off right away. This is where, they seem to last longer since you still have alot of punch throught out your run, but it's the batteries chemistry that allows this.


This statement is completely wrong.

The mah rating is capacity, pure and simple. A 3000 battery will last 50-ish percent longer than a 2100, if it's in the same car with the same gearing.

Crazy Canuck
09-28-2002, 01:10 PM
Originally posted by sosidge
This statement is completely wrong.

The mah rating is capacity, pure and simple. A 3000 battery will last 50-ish percent longer than a 2100, if it's in the same car with the same gearing.

Yeah, voltage is what creates speed. 3000 = 3 amp-hours, meaning it could supply 3 amps for 1 hr, 6 amps for 1/2 hr, etc.

The "3000" has nothing to do with speed.

Crashmaxx
09-28-2002, 03:35 PM
And also, you don't want to cool a pack while charging it, it will false peak and over charge. Battery experts told me this.

FrankW
09-28-2002, 05:33 PM
2100 Mah = 126 amp-minutes

3000 Mah = 180 amp-minutes

If you pull 20 amps in with your RC set-up you will get about 6.3 minutes of run time on 2100 Mah pack. If you pull the same 20 amps with the 3000 Mah pack you will get about 9 minutes of run time.

This means with the 3000 packs you will recieve about 2.7 minutes (43%) more run-time.

-Framl