** LIPO BASICS ** Read me first! - Page 7 - HeliFreak
Fun, Learning, Friendship and Mutual Respect START  HERE


Unregistered
Go Back   HeliFreak > R/C Batteries and Charging Support > LiIon, LiPo, NiCd & NiMh General


LiIon, LiPo, NiCd & NiMh General General Battery Support


Reply
 
LinkBack Thread Tools Display Modes
Old 12-20-2012, 07:10 PM   #121 (permalink)
Registered Users
 
Posts: 89
 

Join Date: Aug 2012
Location: Singapore
Default

yah the PO = polymer was supposed to be a solid polymer electrolyte which was all the rage in the early 90's but never successful except for the japanese. increased safety due to dry solid battery.
lithium ion and current li-polymer cells have the same energy density. rc cells are less energy dense due to the higher c rate. higher the c rate, the heavier the cell for the same capacity.
the current pouch format is merely an aluminium pouch/bag which yes its insulated but thats it.
__________________
REVO John
facebook.com/likeREVO
REVOJohn is offline        Reply With Quote Quick reply to this message
Sponsored Links
Advertisement
 
Old 12-20-2012, 07:14 PM   #122 (permalink)
Registered Users
 
Posts: 511
 

Join Date: Aug 2011
Location: Midland, Tx
Default

I wish I would saw this a few hrs ago before I made a battery specific post


Beep, Beep, Honk, Honk, Over and Out Rotorhead
__________________
Any Landing you can walk away from, is a good landing...
nuttzzy is offline        Reply With Quote Quick reply to this message
Old 12-20-2012, 09:03 PM   #123 (permalink)
Registered Users
 

Join Date: Jul 2012
Location: Costa Rica
Default

Hi there

I bought 4 brand new nano tech batteries. I am about to start the break in process. How long should I wait in between each charge and discharge procedure? Can I do it back to back or is it more advisable to leave them resting for a few minutes or hours before the next round?

Thanks!
Jo
__________________
Learning each step of the way in the R/C heli world!!!
Phoenix V4
Futaba T7C
T-rex 450Pro DFC w/ 3GX v3.0
josecr is offline        Reply With Quote Quick reply to this message
Old 12-20-2012, 09:24 PM   #124 (permalink)
Registered Users
Thread Starter Thread Starter
 
My HF Map location
Join Date: May 2008
Location: Maplewood, MN
Default

I just do 5 cycles back to back... and I use one pack to power the charger for the other so I can do them in pairs.
Slyster is offline        Reply With Quote Quick reply to this message
Old 12-21-2012, 06:19 AM   #125 (permalink)
Registered Users
 

Join Date: Jul 2012
Location: Europe
Default

Quote:
Originally Posted by REVOJohn View Post
fyi guys

i can confirm hundred percent that there is no such need to run in lipo batteries.
merely buy, charge and play. the mere formation process of lipo batteries will bring the battery to a state of ready to run. not the case for lifepo4 though.. they get better on running in. if anything you are merely shortening the life cycle than anything else. anyone who tells you that you need to run-in lipo packs either had bad quality packs that have not been through a proper formation process or does not know what they are on about. happy flying guys

oh point 2. there is no such think is rc hobby are lithium polymer battery. there is no polymer. its standard lithium ion. the polymer is another misconception in the industry
Cool. What about the common advice not to parallel charge lipos until after a few cycles?

Although not completely intentional, I tried parallel charge some brand new small 1s lipos and the charger took them up way beyond 4.2v. Now, this was on a charger that shouldn't be trusted. I'm sure things would have been different on a proper charger but the fact remains, something about parallel charging new lipos confused the charger, unless it was just a coincidence. Much can be said about the quality of that charger, it had some issues, but it never acted out this quite this much before the incident.

No, I'm not using that charger any more. I retired it faster then you can say turnigy.

It would be very appreciated with some more of your insights.
Kendo is offline        Reply With Quote Quick reply to this message
Old 12-21-2012, 07:04 AM   #126 (permalink)
Registered Users
 
Posts: 2,391
 

Join Date: Dec 2007
Location: Fayetteville, GA - USA
Default

Quote:
Originally Posted by Kendo View Post
What about the common advice not to parallel charge lipos until after a few cycles?
I can answer this one. It's all about the numbers. If you hook up each battery and ensure they are all at around the same voltage per cell, then there is absolutely no reason they won't parallel charge. The key to parallel charging is that each battery needs to be close to the same level and balanced. If they are new, there is a chance this won't be the case. The total voltage could be wildly off between packs and/or the individual cells won't be properly balanced.

If you have a way to check the packs, such as the monitor mode of the iCharger 306B, then there is no reaon you couldn't check your batteries FIRST and charge them all together if they are all good and within acceptable tollerances.
__________________
HeliXHeli 700 | VBar Silverline | TRM275TT
TREX 550 V2 DFC | VBar Silverline | CC Ice 100 | CC BEC Pro
Rototerrier is offline        Reply With Quote Quick reply to this message
Old 12-21-2012, 07:46 AM   #127 (permalink)
Registered Users
 
Posts: 89
 

Join Date: Aug 2012
Location: Singapore
Default

yup fully agree.

anyway every so called polymer cells is just many anode and cathode plate stacks inside. parralleling cells is the same as just adding more stacks. the only different as mentioned is the state of charge. cells/packs in different state of charge will load amps from the higest to lowest for sure once parralleled but your charge smells fishy here.......
__________________
REVO John
facebook.com/likeREVO
REVOJohn is offline        Reply With Quote Quick reply to this message
Old 12-21-2012, 10:04 AM   #128 (permalink)
Registered Users
 
Posts: 511
 

Join Date: Aug 2011
Location: Midland, Tx
Default

Ok when do I know to balence? Just periodically do it as a preventative maintanece?


Beep, Beep, Honk, Honk, Over and Out Rotorhead
__________________
Any Landing you can walk away from, is a good landing...
nuttzzy is offline        Reply With Quote Quick reply to this message
Old 12-21-2012, 10:06 AM   #129 (permalink)
Registered Users
Thread Starter Thread Starter
 
My HF Map location
Join Date: May 2008
Location: Maplewood, MN
Default

Always balance charge. In fact with FMA chargers you cannot NOT balance charge it won't let you.
Slyster is offline        Reply With Quote Quick reply to this message
Old 12-21-2012, 10:38 AM   #130 (permalink)
Registered Users
 
Posts: 511
 

Join Date: Aug 2011
Location: Midland, Tx
Default

Mines got a spot for the balence port then the main leads. I been charging threw the mains. Is that's right??


Beep, Beep, Honk, Honk, Over and Out Rotorhead
__________________
Any Landing you can walk away from, is a good landing...
nuttzzy is offline        Reply With Quote Quick reply to this message
Old 12-21-2012, 10:38 AM   #131 (permalink)
Registered Users
 
Posts: 4,831
 

Join Date: Sep 2006
Location: canada
Default

For parallel charging, as long as you hook up the MAINS 1st, let it stabilize you will be fine charging.

even if the packs are not same voltage they will stabilize.(within reason)
__________________
Team Fun / Heli Canada


**When you start to be in complete control reflexes are not a requirement.**
s0laris is offline        Reply With Quote Quick reply to this message
Old 12-21-2012, 12:12 PM   #132 (permalink)
Registered Users
 
Posts: 3,073
 

Join Date: Jan 2010
Location: Seattle, WA
Default

Unless you're using the fused FMA Safe Parallel Adapter.. Then you would plug in the balance leads before plugging in the mains, so the pack can stabilize with limited current transfer. Correct?
__________________
- 6S TREX 450 Pro FBL - ÁBeast, MKS, Castle Creations
- Goblin 500 - Kontronik Pyro 600-12, Jive 100lv, iKon, BK servos
- TBS Discovery - Pixhawk
- Spektrum DX7
SeanM is offline        Reply With Quote Quick reply to this message
Old 12-21-2012, 12:40 PM   #133 (permalink)
Registered Users
 
Posts: 4,831
 

Join Date: Sep 2006
Location: canada
Default

Well i do the mains first as they are capable of a lot more current than balance leads. At least that's my theory. I could be wrong
__________________
Team Fun / Heli Canada


**When you start to be in complete control reflexes are not a requirement.**
s0laris is offline        Reply With Quote Quick reply to this message
Old 12-21-2012, 12:51 PM   #134 (permalink)
Registered Users
Thread Starter Thread Starter
 
My HF Map location
Join Date: May 2008
Location: Maplewood, MN
Default

I would assume a fused parallel board has fuses that blow when the current is too high? To safely connect the balance leads first you would need some sort of resistance to limit the current flow if the packs are unequal.. I doubt they have that.. instead I bet the fuse would blow... and that would get you no where. So I say main leads first.. always.
Slyster is offline        Reply With Quote Quick reply to this message
Old 12-21-2012, 04:30 PM   #135 (permalink)
Registered Users
 
Posts: 3,073
 

Join Date: Jan 2010
Location: Seattle, WA
Default

From my understanding the FMA board uses 'polyfuses' for the balance connections, aka resettable fuses. They're supposed to turn black from red when there's too much current. I've never had this happen, but I believe they will turn red again after you remove the pack.

EDIT: here's a link to explain it in more detail. http://revolectrix.com/faqs.htm?category=54
__________________
- 6S TREX 450 Pro FBL - ÁBeast, MKS, Castle Creations
- Goblin 500 - Kontronik Pyro 600-12, Jive 100lv, iKon, BK servos
- TBS Discovery - Pixhawk
- Spektrum DX7
SeanM is offline        Reply With Quote Quick reply to this message
Old 12-22-2012, 12:56 PM   #136 (permalink)
Registered Users
 
Posts: 33
 

Join Date: Dec 2012
Location: Helsinki
Default

What would be a good charger (with storage level feature) for the e-flite 2 cells with the UMX connector? (The one Carbon Cub and Blade 130x uses)
vmmattil is offline        Reply With Quote Quick reply to this message
Old 12-22-2012, 02:02 PM   #137 (permalink)
Registered Users
Thread Starter Thread Starter
 
My HF Map location
Join Date: May 2008
Location: Maplewood, MN
Default

Any charger would work. Just get the right cables... or make your own.

Good charger for small packs.
http://www.hobbyking.com/hobbyking/s...dProduct=18066

Good source for cables.
www.progressiverc.com
Slyster is offline        Reply With Quote Quick reply to this message
Old 12-25-2012, 01:40 AM   #138 (permalink)
Registered Users
 

Join Date: Mar 2012
Location: Wesley Chapel, FL, just north of Tampa
Question

One of my manuals says that repeated flying to LVC is bad. I assume this is correct?
BrettOssman is offline        Reply With Quote Quick reply to this message
Old 12-25-2012, 01:44 AM   #139 (permalink)
Registered Users
Thread Starter Thread Starter
 
My HF Map location
Join Date: May 2008
Location: Maplewood, MN
Default

Yes LVC usually results in packs ending up at 3.4v (or lower!) in my experience. Voltage is important, but it is more important to know how much you are putting back. What batteries and what charger?
Slyster is offline        Reply With Quote Quick reply to this message
Old 12-25-2012, 01:46 AM   #140 (permalink)
Registered Users
 
Posts: 3,073
 

Join Date: Jan 2010
Location: Seattle, WA
Default

Yes, that's true. Just once is more than enough to cause permanent damage. It may still work afterwards, but it will have lost performance and life expectancy.
__________________
- 6S TREX 450 Pro FBL - ÁBeast, MKS, Castle Creations
- Goblin 500 - Kontronik Pyro 600-12, Jive 100lv, iKon, BK servos
- TBS Discovery - Pixhawk
- Spektrum DX7
SeanM is offline        Reply With Quote Quick reply to this message
Reply




Quick Reply
Message:
Options

Register Now

In order to be able to post messages on the HeliFreak forums, you must first register.
Please enter your desired user name, your REAL and WORKING email address and other required details in the form below.
User Name:
Password
Please enter a password for your user account. Note that passwords are case-sensitive.
Password:
Confirm Password:
Email Address
Please enter a valid email address for yourself. Use a real email address or you will not be granted access to the site. Thank you.
Email Address:
Location
Where do you live? ie: Country, State, City or General Geographic Location please.
Name and Lastname
Enter name and last name here. (This information is not shown to the general public. Optional)
Helicopter #1
Enter Helicopter #1 type and equipment.
Helicopter #2
Enter Helicopter #2 type and equipment.
Helicopter #3
Enter Helicopter #3 type and equipment.
Helicopter #4
Enter Helicopter #4 type and equipment.

Log-in

Human Verification

In order to verify that you are a human and not a spam bot, please enter the answer into the following box below based on the instructions contained in the graphic.



Thread Tools
Display Modes

Posting Rules
You may post new threads
You may 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
Trackbacks are On
Pingbacks are On
Refbacks are On




Copyright © Website Acquisitions Inc. All rights reserved.
vBulletin Security provided by vBSecurity v2.2.2 (Pro) - vBulletin Mods & Addons Copyright © 2018 DragonByte Technologies Ltd.
 

SEO by vBSEO 3.6.1