calculating amps?

[tallyram]

i've searched for 15 minutes and found nothing. how do i figure how many amps a battery will put out?

Originally Posted by tallyram

i've searched for 15 minutes and found nothing. how do i figure how many amps a battery will put out?

It is not so much how much the the battery can put out but can the battery supply what the ESC/motor is asking for...if you go with an Enerland based cell you wont go wrong...and if you go with a Maxamps/True Rc pack go with as much capacity as you can

[tallyram]

no, i need to know how to figure how many amps a pack puts out using the other supplied specs from the pack(c-rating, voltage, and mah). some manufacturers don't give you the number of amps, but give you a c-rating.

[lutach]

Originally Posted by tallyram

no, i need to know how to figure how many amps a pack puts out using the other supplied specs from the pack(c-rating, voltage, and mah). some manufacturers don't give you the number of amps, but give you a c-rating.

I have to agree with what azjc said and there are other good 25-30C options. Get the highest mAh pack that will fit your application. The only way to get more info, is to read what most people are using and view some of the datas posted in the forum. Get yourself a Eagle Tree or a BNB Products data recorder.

Edit: You can multiply the C rating with the A (5000mAh=5A) and you will have your AMP for that pack. Just remember there are packs out in the market that claims a high C rating, but they can't come close to it.

[tallyram]

thank you for the help! i know you guys mean well, but this is for my crawler. i'll be using an outrunner and i'm limited in space for the pack(s) that i choose. this setup isn't as demanding. i do agree with you, i'm selling both of the evo25 packs i used in my truggy. i tried to use the best in the truggy!

[lincpimp]

Amp rating is based on c rating and mah capacity.

Usually the battery is rated at continuous and burst, continuous is what you should focus on.

Take the mah (milliamp hours) of the battery and divide by 1000 to get ah (amp hours).

Then multiply the ah by the c rating and you have the amp output.

So say we have a 5000mah 20c continuous lipo. 5000/1000=5, 5x20=100amps.

This gets you close, and always factor a 20-25% margin. So if you think you need 80amps, use at least a 100amp capable lipo.

[lutach]

Originally Posted by tallyram

thank you for the help! i know you guys mean well, but this is for my crawler. i'll be using an outrunner and i'm limited in space for the pack(s) that i choose. this setup isn't as demanding. i do agree with you, i'm selling both of the evo25 packs i used in my truggy. i tried to use the best in the truggy!

John Holmes and the crawler thread can help you.

[tallyram]

got it! its not as easy selecting a small pack(s) for these things. really got me searching for info!

[lincpimp]

What is your setup? More info would be helpful. JohnRobHolmes is very knowledgeable and would be a good person to question!

[tallyram]

i've been waiting for him to answer my post in one of his threads on rccrawler.