Electric Training If you are new to electric learn more about them here or ask questions.

Battery Management

Reply
Old 03-20-2013, 06:23 AM
  #1
Boeing
Thread Starter
 
Join Date: Nov 2002
Location: Alamogordo, NM
Posts: 143
Gallery
My Gallery
Models
My Models
Ratings
My Feedback
Default Battery Management

I am a new guy in the area of electric flight. I have read that it is a good idea to draw down a battery to 70% to 80% of it labeled capacity - mAh. Am I on the right track to maintain a battery in good condition? Is there a charger/measurement tool available to measure the current level of a battery?

Thanks for the information.
Boeing is offline  
Reply With Quote
Old 03-20-2013, 06:39 AM
  #2
BarracudaHockey
Community Moderators
 
BarracudaHockey's Avatar
 
Join Date: Jul 2003
Location: Jacksonville, FL
Posts: 21,802
Gallery
My Gallery
Models
My Models
Ratings
My Feedback
Default RE: Battery Management

Consume no more than 80 percent of capacity to keep your pack happy.

Also discharge rate is important, make sure you have a properly C rated battery for the amps you're system will pull
BarracudaHockey is online now  
Reply With Quote
Old 03-20-2013, 04:31 PM
  #3
spog1
 
Join Date: Feb 2006
Location: , ON, CANADA
Posts: 183
Gallery
My Gallery
Models
My Models
Ratings
My Feedback
Default RE: Battery Management

All you need to measure is a voltmeter. Measure the battery after sitting at least 5 min after discharging. 80% discharged is about 3.7 volts/cell.
spog1 is offline  
Reply With Quote
Old 03-24-2013, 12:52 AM
  #4
siberianhusky
 
siberianhusky's Avatar
 
Join Date: Nov 2009
Location: Peterborough, ON, CANADA
Posts: 611
Gallery
My Gallery
Models
My Models
Ratings
My Feedback
Default RE: Battery Management

http://www.hobbyking.com/hobbyking/s...itor_2_6S.html

One of these is cheap enough and accurate enough for a quick voltage check. Not as accurate as a meter.
Tested mine against my meter and it's 0.05v low at full charge. Could change with voltage but I figure it's close enough.
Just plugs into the balance port, gives total and individual cell voltages.
Available all over the place, just knew where they are in the HK catalog.
siberianhusky is offline  
Reply With Quote
Old 05-12-2013, 08:37 AM
  #5
aeajr
 
aeajr's Avatar
 
Join Date: Jan 2003
Location: Long Island, NY
Posts: 8,546
Gallery
My Gallery
Models
My Models
Ratings
My Feedback
Default RE: Battery Management


Quote:
ORIGINAL: Boeing

I am a new guy in the area of electric flight. I have read that it is a good idea to draw down a battery to 70% to 80% of it labeled capacity - mAh. Am I on the right track to maintain a battery in good condition? Is there a charger/measurement tool available to measure the current level of a battery?

Thanks for the information.
Depending on how you mean this it could be a old rule left from the old NiCd days. Those batteries had a memory effect. If you did not discharge them all the way they would develop a memory and over time would hold less and less charge. So it was common to run them down before charging them.

If you are talking Lipo batteries then running them down more than 80% will likely damage them. Actually best practice says you never get them below 3V per cell, resting voltage. If they get below 2.5 they start to take damage and the difference in charge level between 2.5 and 3 ain't much.

To measure the load your motor is putting on your battery you use a wattmeter. This is the one Iuse:
http://www.amazon.com/Watts-Meter-An...words=watts+up

If you want to measure the charge level of a battery you use a battery checker:
http://www3.towerhobbies.com/cgi-bin...?&I=LXCBUV&P=7


For more info, read here:
EVERYTHING YOU WANTED TO KNOW ABOUT ELECTRIC POWERED FLIGHT
aeajr is offline  
Reply With Quote
Reply


Thread Tools
Search this Thread
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off



All times are GMT -8. The time now is 07:32 AM.