New Products Flash Sale
Thread Tools
Old Feb 25, 2010, 06:37 PM
RamboFlier is offline
Find More Posts by RamboFlier
Registered User
Discussion

20C vs. 40C Watts at same discharge rate?


Given three exact batteries except the C rating...

1800mAh 4S Lipo Pack 20C
Constant Discharge: 20C (36A)
Peak Discharge (10sec): 30C (54A)

1800mAh 4S Lipo Pack 30C
Constant Discharge: 30C (54A)
Peak Discharge (10sec): 40C (72A)

1800mAh 4S Lipo Pack 40C
Constant Discharge: 40C (72A)
Peak Discharge (10sec): 50C (90A)

With the same discharge rate of 36Amp for each pack, would the 40C pack hold its Voltage better and offer higher Wattage?
Sign up now
to remove ads between posts
Old Feb 25, 2010, 07:44 PM
write2dgray is offline
Find More Posts by write2dgray
write2dgray's Avatar
Theoretically, yes .
Site Sponsor
Old Feb 25, 2010, 07:59 PM
Challenger 413 is offline
Find More Posts by Challenger 413
Registered User
Challenger 413's Avatar
Adding to that...Depends a lot on the cells and if they can hold voltage under a load. It could be that a 25C pack that is better made (better cells) can hold higher volts under a load than a cheaper 40C pack...

Challenger413
Old Feb 25, 2010, 09:04 PM
earlwb is offline
Find More Posts by earlwb
Registered User
earlwb's Avatar
Also if the packs C rating is correct, then the 40C pack won't get as warm as a 20C pack would at the same discharge rate. The 40C battery is supposed to have less internal resistance than a 20C pack.
RCG Plus Member
Old Feb 26, 2010, 12:28 AM
Himalaya is offline
Find More Posts by Himalaya
Registered User
Himalaya's Avatar
using acurately rated(neither over nor under rating) 40C and 20C packs:

at 20C discharge, you get roughly 5.6% more voltage and 11% more power from the 40C pack.

at 40C bursts, you get 12.5% more voltage and 26.6% more power from the 40C pack.
....
....
....
at 5C mild discharge, you get 1.3% more volts and 2.6% more power from the 40C pack.


Thread Tools

Similar Threads
Category Thread Thread Starter Forum Replies Last Post
Help! Is it possible to charge and discharge a battery at the same time? CoolBudz DIY Electronics 133 Mar 19, 2011 10:10 AM
Discussion Discharge rate of lipo battery Sparken57 Batteries and Chargers 7 Feb 11, 2010 11:18 PM
Question Turnigy 4s 3000 40c VS Flightmax 4s 3000 40c huggett Batteries and Chargers 2 Jan 06, 2010 10:02 AM
Discussion Help..... Do TP packs have the same mAh regardless of the rate you discharge? imxz28 Batteries and Chargers 2 Feb 23, 2008 02:59 PM
Discussion 20C Enerland and CommonSenseRCs, 9 cycles @ Max. Discharge Rate, CBA Graphs RD Blakeslee Batteries and Chargers 17 May 21, 2006 10:55 PM