HobbyKing.com New Products Flash Sale
Reply
Thread Tools
Old Jan 02, 2005, 10:44 PM
Permanently Banned
San Jose Ca / RSA flyer
Joined May 2003
8,030 Posts
Lipo Cell Voltage Rise when Discharging

Has anyone seen a rising voltage on a lipo cell when discharging thru a tail-light bulb being monitored with DVM. The rise went on for a few minutes and then began a normal voltage decay afterwards

I was testing a 1550 Tanic cell 12C discharging thru a 10V 25W tail-light type bulb.
hall woo is offline Find More Posts by hall woo
Reply With Quote
Sign up now
to remove ads between posts
Old Jan 02, 2005, 10:52 PM
Registered User
sneu's Avatar
United States, CA, San Diego
Joined Dec 1999
7,353 Posts
Quote:
Originally Posted by hall woo
Has anyone seen a rising voltage on a lipo cell when discharging thru a tail-light bulb being monitored with DVM. The rise went on for a few minutes and then began a normal voltage decay afterwards

I was testing a 1550 Tanic cell 12C discharging thru a 10V 25W tail-light type bulb.
That is common as the cells heat up from their resistance. The chemical reactions becomes more active.

Steve
sneu is offline Find More Posts by sneu
Reply With Quote
Old Jan 02, 2005, 10:59 PM
Permanently Banned
San Jose Ca / RSA flyer
Joined May 2003
8,030 Posts
Waking up a LIPO cell

So a slow discharge helps to " WAKE UP a LIPO" pack
hall woo is offline Find More Posts by hall woo
Reply With Quote
Old Jan 03, 2005, 07:07 AM
Southern Pride
everydayflyer's Avatar
Haralson County GA. USA
Joined Oct 2004
34,812 Posts
Quote:
Originally Posted by hall woo
So a slow discharge helps to " WAKE UP a LIPO" pack
Go here and look at the chart especially the red line.
If LiPos are below their ideal temp. then yes a moderate to heavy drain will raise the temp , and the volts come up.
That is the reason in the cold I fly(push) Li Pos hard for the first minute or so to get their jucies flowing just like warming your automobile on a frosty morn'.
http://www.rcgroups.com/forums/showp...7&postcount=36
Here is a link to another example. Note the Green line for the Kokam 1500.
http://www.rcgroups.com/forums/showp...5&postcount=23


Charles
everydayflyer is online now Find More Posts by everydayflyer
Last edited by everydayflyer; Jan 03, 2005 at 08:37 AM.
Reply With Quote
Reply


Thread Tools

Similar Threads
Category Thread Thread Starter Forum Replies Last Post
Discussion did a lipo cell voltage check Odrapnew Micro Helis 19 Sep 25, 2009 11:37 PM
Discussion LiPo Cell Voltage Difference/When to Balance? Keven_C Batteries and Chargers 5 Jun 08, 2007 05:18 PM
Discussion Safest way to check lipo cell voltage? rainedave Batteries and Chargers 11 Feb 01, 2007 02:10 AM
Lipo cell balanceing while high discharging misskimo Batteries and Chargers 10 Feb 14, 2005 03:43 PM
Is 3 volt OK when discharging LiPo Stig C Batteries and Chargers 1 Jul 07, 2004 09:38 AM