discharging/storage charge question - WattFlyer RC Electric Flight Forums - Discuss radio control eflight

Batteries & Chargers Discuss Li-P, Li-Ion, NiMh, Nicad battery technology and the chargers that juice 'em up!

discharging/storage charge question

Old 08-01-2016, 02:55 AM
Love my Stinger
Thread Starter
Fishbonez's Avatar
Join Date: Apr 2011
Location: Wyoming
Posts: 2,946
Default discharging/storage charge question

Ok it may be a common sense answer but none the less I was curious.
We all know that for safety reasons never charge a lipo unsupervised.
However is it the same with discharging or putting on storage charge? I would assume yes with a battery that may be damaged but I mean just an everyday battery that may not have gotten used that day during flights etc
Fishbonez is offline  
Old 08-01-2016, 03:16 AM
Super Contributor
fhhuber's Avatar
Join Date: Mar 2013
Posts: 4,786

Best to not discharge unsupervised....

Its more likely to damage the LiPo due to overdischarge than any other issue. Fire risk is much lower than charging.

I like to discharge via a high power model which trips LVC at 3.7 to 3.8 v/cell at WOT. Appx 3 min to take a full pack to storage.
fhhuber is offline  
Old 08-01-2016, 10:35 AM
Super Contributor
solentlife's Avatar
Join Date: Oct 2010
Location: Ex UK Brit now in Latvia west coast - Ventspils
Posts: 12,426

I know I will get stick for this - but I cannot watch my lipo's totally, so I do have occassions of them alone.

I have just binned a 5S pack after connecting to take to storage though not using at site - I could feel the pack getting warm. The discharge rate was only 4A. Turned out to have a faulty cell and even the low rate discharge was showing signs of distress.

I am one who works in a Paranoid industry that Safety is drummed into us so much that in fact I believe has opposite effect. Fine for bosses and company's to say - WE train our people etc. but reality is over emphasis leads to turning people off.
This I believe is case with LiPo's as well. The level of paranoia and info to religiously stand over LiPo's and charge in earthernware pots, ammo cans etc. etc. is such that I can see it being counter productive. This is my personal view and I know will not gel with many.

Answer to post 1 ... LiPo's should be attended during any phase of changing state. IMHO

solentlife is offline  
Old 08-01-2016, 01:01 PM
Super Contributor
JetPlaneFlyer's Avatar
Join Date: Mar 2009
Location: Aberdeen, Scotland
Posts: 6,121

IMHO it depends where the discharging is taking place. If it's in your home with lots of stuff that could catch fire in the vicinity then most certainly watch them like a hawk (or better yet do it somewhere else)

On the other hand if they are in a safe environment where there is no chance of a fire escalating then what's the worst that can happen? Bear in mind though that during discharging it's the charger/discharger that is more likely to burst into flames rather than the battery itself.

Discharging with the average charger can take hours, so practically it's hard to watch them all the time. I've made a discharge setup that will discharge at a constant 40A / 1000W so it will discharge most batteries in a few minutes. This makes the process a lot safer IMHO as you can easily keep an eye on them. Discharging in the model is ok but can cause overheating of the motor/ESC due to reduced airflow, plus I have large helis which cant be run up indoors if you like to keep your limbs attached.
JetPlaneFlyer is offline  
Old 08-01-2016, 06:16 PM
Community Moderator
crxmanpat's Avatar
Join Date: Feb 2006
Location: Mesa, AZ
Posts: 6,859

Good rule of thumb is to never leave a lipo unsupervised if it is hooked to any kind of power source.
crxmanpat is offline  
Old 08-01-2016, 10:29 PM
birdDog's Avatar
Join Date: Nov 2007
Location: Too close to Chicago.
Posts: 2,433

I'm with fhhuber on the discharge technique. I just anchor a big plane to the bench and let it run down. Wattmeter in-line and run the amps at an appropriate level.
birdDog is offline  
Old 08-02-2016, 06:38 AM
Super Contributor
solentlife's Avatar
Join Date: Oct 2010
Location: Ex UK Brit now in Latvia west coast - Ventspils
Posts: 12,426

$15 and a 3in1 battery discharger from MyRCMart does good job with auto shut off at user settable cell voltage.


Last edited by solentlife; 08-03-2016 at 02:50 PM.
solentlife is offline  
Old 08-03-2016, 02:26 PM
maxflyer's Avatar
Join Date: Sep 2012
Location: Santa Fe, NM
Posts: 362

I realize I am at a bit of risk, but I have a lot of faith in my expensive PL8 charger, which has been worth every penny, and commonly leave it unattended in my studio for short periods. I would be less likely to leave it unattended if I were dealing with a battery that was in questionable condition.
maxflyer is offline  
Related Topics
Thread Starter
Last Post
Batteries & Chargers
02-03-2013 07:11 PM
Batteries & Chargers
10-29-2012 03:20 PM
FMA Direct
10-05-2012 05:55 AM
Batteries & Chargers
09-19-2012 02:58 AM
Batteries & Chargers
03-17-2012 12:43 AM

Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
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

Quick Reply: discharging/storage charge question

Contact Us Archive Advertising Cookie Policy Privacy Statement Terms of Service

Copyright 2018 MH Sub I, LLC dba Internet Brands. All rights reserved. Use of this site indicates your consent to the Terms of Use.

Page generated in 0.09995 seconds with 13 queries