HobbyKing.com New Products Flash Sale
Reply
Thread Tools
Old Aug 29, 2009, 09:52 PM
Flying Under the Radar
Massachusetts
Joined Mar 2009
888 Posts
Discussion
helicopter's lipo gone bad or not...

hello, i just charged up my 2S lipo 800 Mah. i forgot take it out of the plug and left it for about 20mins extra on the charger after it was done charging. mine doesnt have auto cut-off thing. its a simple charger. so when i tried to fly it i gave it full throttle and it only lifed about 2 feet off the ground. i tried my xtreme carbon fibre baldes, and that didnt help, so is the lipo going bad, it isn't puffed or anything, didnt even get warm on the charger. i charged it twice and same results. please help...

EDIT:now the stock esky lipo charger is charging it just fine...dont know what was wrong with it..ill test it out with my heli after its finished charging...
1jet14 is offline Find More Posts by 1jet14
Last edited by 1jet14; Aug 30, 2009 at 02:11 PM.
Reply With Quote
Sign up now
to remove ads between posts
Old Aug 29, 2009, 11:13 PM
Registered User
Windsor,N.C.
Joined Dec 2008
89 Posts
Any way you can check each cell for volts full they should be 4.2.
Donald Byrum is offline Find More Posts by Donald Byrum
Reply With Quote
Old Aug 29, 2009, 11:26 PM
Flying Under the Radar
Massachusetts
Joined Mar 2009
888 Posts
no, ill charge it up again...the next day.
1jet14 is offline Find More Posts by 1jet14
Reply With Quote
Old Aug 29, 2009, 11:39 PM
Registered User
DanT's Avatar
San Angelo TX.
Joined Feb 2006
1,191 Posts
It could be your motors also!!! But if your going to fly electrics you need to buy a better charger one with a LCD screen read out...
DanT is offline Find More Posts by DanT
Reply With Quote
Old Aug 30, 2009, 07:02 AM
Space Coast USA
hoppy's Avatar
Space Coast
Joined Oct 2000
20,814 Posts
You really really need to check the pack (cell) voltages. Checking the individual cell voltages will tell you if something is wrong with the pack or the charger.
I'd hold off on doing anymore charging until you do that as charging damaged/unbalanced lipos can sometimes cause them to ignite.
hoppy is offline Find More Posts by hoppy
Reply With Quote
Old Aug 30, 2009, 10:02 AM
I will be an angry old man!
marc1's Avatar
Vancouver Isl
Joined Apr 2007
1,360 Posts
Quote:
mne[sic] doesnt have auto cut-off thing. its a simple charger.
Really???
marc1 is offline Find More Posts by marc1
Reply With Quote
Old Aug 30, 2009, 10:28 AM
59 years of RC flying
Daedalus66's Avatar
Canada, ON, Ottawa
Joined Feb 2006
16,128 Posts
Any charger that lacks autocutoff is unsafe for use with LiPos.
Daedalus66 is offline Find More Posts by Daedalus66
Reply With Quote
Old Aug 30, 2009, 11:53 AM
Flying Under the Radar
Massachusetts
Joined Mar 2009
888 Posts
so how do i check each individual cell?
1jet14 is offline Find More Posts by 1jet14
Reply With Quote
Old Aug 30, 2009, 12:58 PM
Suspended Account
robinflyer's Avatar
San Jose, CA
Joined Feb 2008
276 Posts
http://www.ritehobby.com/Chargers/Ce...Voltage-Tester
robinflyer is offline Find More Posts by robinflyer
Reply With Quote
Old Aug 30, 2009, 01:04 PM
Space Coast USA
hoppy's Avatar
Space Coast
Joined Oct 2000
20,814 Posts
Quote:
Originally Posted by 1jet14
so how do i check each individual cell?
With a volt meter. Available from Harbor Freight for $5 or less.

Does the pack have a balance connector?

1st measure pack voltage by using volt meter across main power leads.

What is the voltage?

Looking at the top of the balance connector, you'll see the silver colored contacts in the rectangular openings. Measure the voltage on 1&2 and 2&3 pins. BE CAREFUL NOT TO TOUCH THE LEADS TOGETHER or you'll short out the battery. Placing tape over all but the very tips of the voltameter probes helps to prevent shorting.
hoppy is offline Find More Posts by hoppy
Reply With Quote
Old Aug 30, 2009, 01:09 PM
Flying Under the Radar
Massachusetts
Joined Mar 2009
888 Posts
ok thanks very much, so how much should they measure? in each cell and in total 7.4v? right?
1jet14 is offline Find More Posts by 1jet14
Reply With Quote
Old Aug 30, 2009, 01:17 PM
WARNING: May contain spam
Xpress..'s Avatar
Joined Oct 2007
20,933 Posts
^No, each cell should read out 4.20 volts fully charged, or 8.4 volts at the main lead.

And if your charger doesn't have a cutoff, then it's not for lipo use. Even the cheap as dirt ones have auto cutoffs

Leaving the lipo on the charger for an extra 20 mins is perfectly fine, although some chargers might have a discharge rate higher than others. I've left my lipos on my charger for a couple hours over, and they were fine

Oh yeah, get an inexpensive Turnigy Accucel-6. It's a computerized charger that's easy to use, has a bright LCD display that's backlight, and can charge all of the rechargable batteries out there (1-15 NiXX cells, 1-6s lipo/Li-ion/A123, 1-10 cell Pb all from 0.1-5.0 amps). They only cost $35 from Hobby City, and include numerous connectors for different battery types
Xpress.. is offline Find More Posts by Xpress..
Reply With Quote
Old Aug 30, 2009, 01:30 PM
Flying Under the Radar
Massachusetts
Joined Mar 2009
888 Posts
ok, thanks Xpress the charger im using came with the HBFP its a 2S balancing lipo charger...ok ill check the battery again but i think its my charger that isnt working properly...because the battery was low, not below the lowest voltage mark,and i put it to charge and it was finished in about half an hour. the lipo is a 800 mah 2s and the charge rate is 800 mah...all i need now is a battery checker/volt meter...
1jet14 is offline Find More Posts by 1jet14
Reply With Quote
Old Aug 31, 2009, 01:23 AM
Frankenstein recycled packs
rampman's Avatar
USA, AZ, Gilbert
Joined Jan 2006
8,753 Posts
...could still be your pack.
rampman is offline Find More Posts by rampman
Reply With Quote
Old Aug 31, 2009, 01:28 PM
Flying Under the Radar
Massachusetts
Joined Mar 2009
888 Posts
it works fine now...dont know what was up with it.
1jet14 is offline Find More Posts by 1jet14
Reply With Quote
Reply


Thread Tools

Similar Threads
Category Thread Thread Starter Forum Replies Last Post
Wanted Watt Meter, Watt's up Meter...Working or not! kctrading Aircraft - General - Miscellaneous (FS/W) 0 Nov 17, 2007 10:21 PM
Question To build a Guillow's Messerschmitt BF-109 or not? Wally_Gator The Builders Workshop 4 Jan 31, 2007 01:32 PM
Discussion Crashed Lipo's - to use or not?? ericdod Batteries and Chargers 12 Oct 03, 2006 09:19 PM
Yippee! 3S Lipo gone bad, your advice plz thenetpoet Batteries and Chargers 9 Aug 16, 2005 10:43 PM
Dented LiPo Pack. Use or Not? mike98624 Batteries and Chargers 2 Jun 21, 2004 07:28 AM