charging a lipo

Old 12-19-2014, 11:48 AM
  #1  
Tech Regular
Thread Starter
iTrader: (14)
 
pfraser2488's Avatar
 
Join Date: Aug 2010
Location: newbern,tn
Posts: 319
Trader Rating: 14 (100%+)
Default charging a lipo

is it ok to charge you lipo batteries the day before you go to the track?
pfraser2488 is offline  
Old 12-19-2014, 11:53 AM
  #2  
Tech Initiate
iTrader: (1)
 
Join Date: Sep 2012
Posts: 28
Trader Rating: 1 (100%+)
Default

sure?
i'll only storage charge mine if they'll be put away for a few weeks or more
wileynl is offline  
Old 12-19-2014, 12:03 PM
  #3  
Tech Regular
iTrader: (3)
 
thebombster's Avatar
 
Join Date: Aug 2010
Posts: 368
Trader Rating: 3 (100%+)
Default

Perfectly normal, I always balance charge mine at 1c the night before then charge them at 2c when at the track
thebombster is offline  
Old 12-19-2014, 12:16 PM
  #4  
Tech Regular
Thread Starter
iTrader: (14)
 
pfraser2488's Avatar
 
Join Date: Aug 2010
Location: newbern,tn
Posts: 319
Trader Rating: 14 (100%+)
Default

ok great thanks
pfraser2488 is offline  
Old 12-19-2014, 01:51 PM
  #5  
Tech Adept
iTrader: (2)
 
orangutanracer's Avatar
 
Join Date: Jul 2012
Posts: 140
Trader Rating: 2 (100%+)
Default

The instructions that came with some of my batteries say:
Never leave Li-Po battery in fully charged state for more than 2 hours as this could cause cells to swell.

Why risk it? Storage charge them at home and full charge at track before running.
orangutanracer is offline  
Old 12-19-2014, 05:15 PM
  #6  
Tech Regular
iTrader: (3)
 
thebombster's Avatar
 
Join Date: Aug 2010
Posts: 368
Trader Rating: 3 (100%+)
Default

Originally Posted by orangutanracer View Post
The instructions that came with some of my batteries say:
Never leave Li-Po battery in fully charged state for more than 2 hours as this could cause cells to swell.

Why risk it? Storage charge them at home and full charge at track before running.
Because who has time to charge a bunch of llipos the day of the race clearly not a racer, I have never had a problem charging mine the night before and I can assure you I'm not the only racer who does it
thebombster is offline  
Old 12-19-2014, 09:22 PM
  #7  
Tech Adept
iTrader: (2)
 
Join Date: Sep 2014
Posts: 139
Trader Rating: 2 (100%+)
Default

I have always charged my the night before and have never seen any puffing from it.
JOSH H is offline  
Old 12-20-2014, 06:27 AM
  #8  
Tech Elite
iTrader: (24)
 
nckmat's Avatar
 
Join Date: Dec 2007
Posts: 4,430
Trader Rating: 24 (100%+)
Default

Originally Posted by orangutanracer View Post
The instructions that came with some of my batteries say:
Never leave Li-Po battery in fully charged state for more than 2 hours as this could cause cells to swell.

Why risk it? Storage charge them at home and full charge at track before running.
That's an old trick of lesser quality manufacturers so that if something goes wrong with your batteries they can say "ah you must have left them fully charged for more than two hours". Absolute rubbish, if this was the case then you wouldn't be able to leave a laptop or mobile phone turned off for more than two hours either.

A balance charged battery of decent quality can be left charged for days without any noticeable problem, it's not great for their lifespan, it may shorten it a few dozen cycles but when you can buy a 65C 6600mAh battery for under $50 who cares.
nckmat is offline  
Old 12-21-2014, 09:23 PM
  #9  
Tech Regular
iTrader: (5)
 
Join Date: Nov 2014
Location: Melbourne
Posts: 394
Trader Rating: 5 (100%+)
Default

Originally Posted by nckmat View Post
That's an old trick of lesser quality manufacturers so that if something goes wrong with your batteries they can say "ah you must have left them fully charged for more than two hours". Absolute rubbish, if this was the case then you wouldn't be able to leave a laptop or mobile phone turned off for more than two hours either.

A balance charged battery of decent quality can be left charged for days without any noticeable problem, it's not great for their lifespan, it may shorten it a few dozen cycles but when you can buy a 65C 6600mAh battery for under $50 who cares.
Laptop mobiles and other lower power devices do not charge the batteries to 100% state of charge to avoid potential problems whilst in storage and increase the cycle life of the battery. Depending on the application they are typically charged to 90%.

Charging a lipo to 100% the night before is not recommended as it can cause problems.

Best battery performance on track is obtained by charging lipos just before they are to be used. I charge mine so they finish charging just before my next race.
DamianW is offline  
Old 12-21-2014, 09:32 PM
  #10  
Tech Master
iTrader: (15)
 
Join Date: Jun 2004
Location: SoCal
Posts: 1,466
Trader Rating: 15 (100%+)
Default

Doing so will result in your lipo swelling over time.
http://promatchracing.com/IPlipoinstr.pdf
trigger is offline  
Old 12-22-2014, 01:01 AM
  #11  
Tech Elite
iTrader: (27)
 
dan_vector's Avatar
 
Join Date: Oct 2013
Posts: 4,332
Trader Rating: 27 (100%+)
Default

Charge them at the track. Never do so the day before. You get better punch as well if you charge just before your run. Time it right and you'll get a small advantage. Plus why would you charge 'a bunch of lipos'. You only really need 2 on the bench. One in the car ready to go and the 2nd hooked up (and in the lipo pouch!) ready to charge at the right time for the next run.

While we are at it. Never charge a lipo inside the house and never charge one that is not in a lipo sack!!
dan_vector is offline  
Old 12-22-2014, 06:31 PM
  #12  
Tech Adept
iTrader: (18)
 
Join Date: Jun 2012
Location: Lake Norman, NC
Posts: 106
Trader Rating: 18 (100%+)
Default

Originally Posted by nckmat View Post
That's an old trick of lesser quality manufacturers so that if something goes wrong with your batteries they can say "ah you must have left them fully charged for more than two hours". Absolute rubbish, if this was the case then you wouldn't be able to leave a laptop or mobile phone turned off for more than two hours either.

A balance charged battery of decent quality can be left charged for days without any noticeable problem, it's not great for their lifespan, it may shorten it a few dozen cycles but when you can buy a 65C 6600mAh battery for under $50 who cares.
Agree, pure rubbish. I have mine fully charged for days and the batteries last a long time but of course I don't buy crap batteries.
joedeman1969 is offline  
Old 12-22-2014, 07:01 PM
  #13  
Tech Regular
iTrader: (5)
 
Join Date: Nov 2014
Location: Melbourne
Posts: 394
Trader Rating: 5 (100%+)
Default

Originally Posted by joedeman1969 View Post
Agree, pure rubbish. I have mine fully charged for days and the batteries last a long time but of course I don't buy crap batteries.
So what batteries are you using?

What is the temperature the batteries are stored in?
DamianW is offline  
Old 12-24-2014, 08:31 AM
  #14  
Tech Master
iTrader: (2)
 
Mr RCTech's Avatar
 
Join Date: Dec 2005
Posts: 1,336
Trader Rating: 2 (100%+)
Default

Originally Posted by DamianW View Post
So what batteries are you using?

What is the temperature the batteries are stored in?
Orca lipos
Mr RCTech is offline  
Old 12-24-2014, 11:01 AM
  #15  
Tech Champion
 
Join Date: Oct 2007
Posts: 7,342
Default

Originally Posted by joedeman1969 View Post
Agree, pure rubbish. I have mine fully charged for days and the batteries last a long time but of course I don't buy crap batteries.
I've tried it both ways. What I experienced was a higher internal resistance and quicker capacity loss with charging packs ahead of time compared to just in time. Same as most others who test have discovered.

Doesn't mean it can't be done, I just think it's worth knowing the tradeoffs. Batteries are disposable anyway and can be had fairly inexpensively, convenience is probably worth the reduction in performance for many, that's fine.

One item to be especially careful of is temperature changes while charged. Charge state changes with temperature, don't leave a charged pack in a parked car sitting in the sun for example.
Dave H is offline  

Thread Tools
Search this Thread

Contact Us - Archive - Advertising - Cookie Policy - Privacy Statement - Terms of Service - Do Not Sell or Share My Personal Information -

Copyright © 2023 MH Sub I, LLC dba Internet Brands. All rights reserved. Use of this site indicates your consent to the Terms of Use.