# Thread: What difference do the mAh's of a battery make?

1. ## What difference do the mAh's of a battery make?

I have seen MANY mAh ratings for batteries...
Right now I have ONE 3000mAh NiMH 7 cell hump pack...(that Im not even charging all the way because my charger only has a 2000mAh or a 4000mAh rating, and I don't want to overcharge it)

I saw someone post something about a 5000mAh NiMH battery...
What difference would that make?
More power?
More run-time?

2. mAh = mili Amp hours. This is how many miliamps the pack can discharge in one hour. 3000mAh is 3A/hour, thats how much current the pack can deliver in one hour.
A higher mAh means more current/hour which = longer run times.

I really wish they just went ahead and rated batteries in amp hours, but 3000 looks better than 3.

3. Voltage = power
MaH (milli amp hour) means how long your batteries will last, but a higher voltage will drain your batteries faster.
Example:
5000Mah 6c Nimh will last longer then 5000Mah 7c Nimh

4. Originally Posted by CoolestDinosoar
I have seen MANY mAh ratings for batteries...
Right now I have ONE 3000mAh NiMH 7 cell hump pack...(that Im not even charging all the way because my charger only has a 2000mAh or a 4000mAh rating, and I don't want to overcharge it)

I saw someone post something about a 5000mAh NiMH battery...
What difference would that make?
More power?
More run-time?
Are you sure that's not a 2-amp or 4-amp CHARGE RATE? Which charger do you have? I've never heard of one limiting you by only being able to charge certain capacities.

5. Hey Dinosaur, can you make a thread for rally please? I'm not to sure how to start one.

6. Originally Posted by ksb51rl
Are you sure that's not a 2-amp or 4-amp CHARGE RATE? Which charger do you have? I've never heard of one limiting you by only being able to charge certain capacities.
Neither have I but you never know what Taiwan is going to think of next.

7. Okay.
That is what I figured. Now I know why my truck seems to last just shy of 12 or 13 minutes when I run it really hard...
Ill have to look into some higher mAh batteries

And the mAmps and not just the Amps is probably just a marketing ploy
bigger numbers on things usually look better

8. it has a "charge current range" of 1, 2, and 4 amps.
It is a ONYX100...
Im not a battery expert, so I dont know what any of this means.
It says that it should charge a 2000mAh battery in 90 minutes on the 2A setting, and a 4000mAh battery in 90 minutes on the 4A setting.
It has an auto-shutoff after 90 minutes, so even if it has a CHARGE RATE, then it would still turn of after charging 2A of the battery (i think)
Im confused now...
Im looking at the direction manual for the charger, and its not helping me at all

9. HEY! I was reading through the directions and found something I didnt see before.
It says for batteries from 2500mAh to 6000mAh, to put it on the 4A selector!
Ive been putting it on the 2A
Would the directions be telling me something bad?
Should I just suck it up and charge it on the 2A setting?
will charging it as 4A damage a 3000mAh battery?

10. The charge rate is how fast it charges the battery, to put it simply.
2Amp will charge your battery all the way but take longer and keep the battery cooler during charge. 4Amp will charge the battery faster but cause the battery to heat up more. 3000mah divided by 2000mah(2 amp)=1.5 hrs to charge. 3000mah divided by 4000mah(4amp)=0.75 hrs (45 minutes)to charge.
Either one will fully charge your battery. But keep an eye on how hot your battery is getting.

There are other factors to consider when choosing charge rate besides heating of the battery. A lower charge rate tends to give the battery a slightly longer run time and higher charge rate can give the battery a bit more "punch".
For racing purposes I used to charge my 3300 mah,s at 5Amp with the use of temperature sensor to prevent excessive over heating.

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