RunRyder RC
WATCH
 1 page 1372 views POST REPLY
HomeRC & PowerAircraftHelicopter
e-
Electric Battery-Charger-pSupply
› mAh vs "C" rating
02-22-2013 11:34 AM  5 years agoPost 1
tgalo

rrVeteran

USA

My Posts: All  Forum  Topic

If I'm just looking for slightly longer flight times, higher mAh or higher "C" or both? I'm just a slow flying scale type guy. No 3D stuff

Gravity's a bitch ant it?

PM  EMAIL  GALLERY  Attn:RR  Quote
02-22-2013 02:55 PM  5 years agoPost 2
Dr.Don

rrVeteran

Cedar Park, TX -- USA

My Posts: All  Forum  Topic

You need more mah. C rating refers to how much current the lipo can deliver over a sustained period, which is in essence a statement primarily about internal resistance. For longer flight time you need a bigger bucket of energy, i.e. higher capacity (mah).

Dr.Don

PM  EMAIL  GALLERY  Attn:RR  Quote
02-22-2013 03:51 PM  5 years agoPost 3
JKos

rrProfessor

Redondo Beach, CA

My Posts: All  Forum  Topic

Yep, think of the battery as a bucket with a valve in the bottom. The bigger the bucket (mAh), the more water. The bigger the valve (C rating), the faster the bucket can potentially be emptied but it's still the same amount of water.

- John

PM  EMAIL  GALLERY  Attn:RR  Quote
03-05-2013 02:08 PM  5 years agoPost 4
Richardmid1

rrProfessor

Leeds, England

My Posts: All  Forum  Topic

Using a smaller pinion or simply running a slower head speed is the cheapest and easiest way to get longer flights, after that its more capacity (mAh) or smaller motor.

60% of the time, it works every time!

PM  EMAIL  HOMEPAGE  GALLERY  Attn:RR  Quote
03-25-2013 03:29 AM  5 years agoPost 5
DougPenhall

rrApprentice

San Jose, CA - USA

My Posts: All  Forum  Topic

C rating is a strange unit because what it means depends on the mAh of the battery.

25C on a 500mAh battery means half the current of 25C on a 1000mAh battery.

To make it simple, 1C means that the fastest rate you're allowed to drain the battery is such that is completely drains in 1 hour. 2C means you can drain the battery twice in one hour, or once in 1/2 hour (of course you can only drain the battery once, then you have to charge it again.)

This means that a 30C battery can be drained in 2 minutes, and a 60C battery can be drained in 1 minute. The faster you drain the battery, the more power you are using. If you try to drain a LiPO battery faster than it's rated it will most likely destroy the battery. If you stay well below the C rating your battery will be able to be charged more times and will maintain it's mAh rating for a longer number of charges. It will still degrade but slower. C ratings therefor effect the longevity of the battery.

The length of your flights have nothing to do with the C rating unless you happen to be drawing more current than the C rating and mAh allow. In the case where you're drawing more current than rated, the battery will overheat and the internal resistance will increase and the voltage will drop and your helicopter will loose power before the power contained within the battery is used up and you'll have to wait for the battery to cool down before you can fly again (if you haven't destroyed the battery).

Anyway, 20C means the battery can be drained 20 times in 1 hour, or in 3 minutes. If you have a 1000mAh battery, then 1000mAh 20 times in 1 hour is 20,000mA or 20 Amps.

A 20C 500mAh battery can supply (20C*500mAh) 10,000mA or 10 Amps.

Let's say you have a helicopter that requires 10 amps to fly. You can use a 20C, 500mAh battery to fly for 3 minutes, or you can use a 10C 1000mAh battery to fly for 6 minutes. If you use a 20C 1000mAh battery you'll still only fly for 6 minutes even though the battery can supply 20 Amps because the helicopter won't draw 20 Amps. However, since you're using the battery at half it's rated capacity (10 Amps) it will last for more charges and will be less likely to overheat and get destroyed.

PM  EMAIL  Attn:RR  Quote
WATCH
 1 page 1372 views POST REPLY
HomeRC & PowerAircraftHelicopter
e-
Electric Battery-Charger-pSupply
› mAh vs "C" rating
 Print TOPIC  Make Suggestion 

 4  Topic Subscribe

Thursday, November 15 - 8:28 am - Copyright © 2000-2018 RunRyder   EMAILEnable Cookies

The RC discussion world needs to consolidate. RR is now one choice for that. Its software is cutting edge. It hosts on-topic advertising. Help RR increase traffic buy making suggestions, posting in RR's new areas (sites) and by spreading the word.

The RunRyder Difference

• Category system to allow Rep/Vendor postings.
• Classifieds with sold (hidden) category.
• Classifieds with separate view new.
• Answer PMs offsite via email reply.
• Member gallery photos with advanced scripting.
• Gallery photo viewer integrated into postings.
• Highly refined search with advanced back end.
• Hosts its own high end fast response servers.
• Hosts thousands of HD event coverage videos.
• Rewrote entire code base with latest technology.
• No off-topic (annoying) click bait advertising.
Login Here
 New Subscriptions 
 Buddies Online